We look at the division of 87621207 by 509 
Our goal is to divide 87621207 by 509.

On to step 1:
The number 509 fits into 8 0 times, leaving a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Fetch the next digit (7) from the dividend, attach it to 8 and continue: 87 / 509

Let's proceed to step 2:
The number 509 fits into 87 0 times, leaving a remainder of 87.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 87 after subtracting 0 from 87.
Grab the next digit (6) from the dividend, add it to 87, then carry on: 876 / 509

Going ahead to step 3:
The number 509 fits into 876 1 times, leaving a remainder of 367.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 509 from 876 and we're left with 367.
Bring next digit (2) of the dividend behind the 367 and repeat the process: 3672 / 509

Going ahead to step 4:
509 goes into 3672 7 times with a remainder of 109.
The next digit of our result is 7. 
Result so far: 17.0
Subtract 3563 from 3672 to get 109.
Fetch the next digit (1) from the dividend, attach it to 109 and continue: 1091 / 509

Advancing to step 5:
509 can be fit into 1091 2 times, resulting in a remainder of 73.
Write down 2 as next digit of the result. 
Result so far: 172.0
If we subtract 1018 from 1091, we get 73.
Take the next digit (2) from the dividend and append it to 73, then repeat: 732 / 509

Let's proceed to step 6:
732 divided by 509 is 1 with a remainder of 223.
Use 1 as the next digit of our solution. 
Result so far: 1721.0
Deduct 509 from 732 and we're left with 223.
Take the next digit (0) from the dividend and append it to 223, then repeat: 2230 / 509

Moving on to step 7:
509 can be fit into 2230 4 times, resulting in a remainder of 194.
Put 4 as the next digit of the answer. 
Result so far: 17214.0
The remainder is 194 after subtracting 2036 from 2230.
Grab the next digit (7) from the dividend, add it to 194, then carry on: 1947 / 509

Going ahead to step 8:
509 can be fit into 1947 3 times, resulting in a remainder of 420.
The number 3 becomes the next digit in our result. 
Result so far: 172143.0
If we take 1527 away from 1947, we end up with 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4200, and continue the process.

Advancing to step 9:
509 goes into 4200 8 times with a remainder of 128.
The next digit of our result is 8. 
Result so far: 172143.8
Deduct 4072 from 4200 and we're left with 128.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

Let's proceed to step 10:
509 goes into 1280 2 times with a remainder of 262.
The number 2 becomes the next digit in our result. 
Result so far: 172143.82
Deduct 1018 from 1280 and we're left with 262.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2620, and continue the process.

Let's proceed to step 11:
If we divide 2620 by 509, we get 5 and a remainder of 75.
Use 5 as the next digit of our solution. 
Result so far: 172143.825
If we take 2545 away from 2620, we end up with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Step 12:
When dividing 750 by 509, we get 1 with a remainder of 241.
Record the quotient 1 as the next digit in the result. 
Result so far: 172143.8251
If we subtract 509 from 750, we get 241.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2410, and continue the process.

On to step 13:
509 goes into 2410 4 times with a remainder of 374.
Record the quotient 4 as the next digit in the result. 
Result so far: 172143.82514
Deduct 2036 from 2410 and we're left with 374.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3740, and continue the process.

On to step 14:
The number 509 fits into 3740 7 times, leaving a remainder of 177.
Use 7 as the next digit of our solution. 
Result so far: 172143.825147
The remainder is 177 after subtracting 3563 from 3740.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1770, and continue the process.

On to step 15:
509 can be fit into 1770 3 times, resulting in a remainder of 243.
Put 3 as the next digit of the answer. 
Result so far: 172143.8251473
Subtracting 1527 from 1770 leaves us with 243.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2430, and continue the process.

Going ahead to step 16:
If we divide 2430 by 509, we get 4 and a remainder of 394.
Record the quotient 4 as the next digit in the result. 
Result so far: 172143.82514734
Subtract 2036 from 2430 to get 394.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3940, and continue the process.

After the division, we end up with 172143.82514734 and a remainder of 3.94e-07.