We look at the division of 39712811 by 509 
We want to divide 39712811 by 509.

Advancing to step 1:
If we divide 3 by 509, we get 0 and a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 509

Advancing to step 2:
If we divide 39 by 509, we get 0 and a remainder of 39.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 39 after subtracting 0 from 39.
Append the next digit (7) from the dividend to 39 and continue with: 397 / 509

Moving on to step 3:
When dividing 397 by 509, we get 0 with a remainder of 397.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 397 to get 397.
Bring next digit (1) of the dividend behind the 397 and repeat the process: 3971 / 509

Step 4:
3971 divided by 509 is 7 with a remainder of 408.
Write down 7 as next digit of the result. 
Result so far: 7.0
The remainder is 408 after subtracting 3563 from 3971.
Fetch the next digit (2) from the dividend, attach it to 408 and continue: 4082 / 509

Advancing to step 5:
When dividing 4082 by 509, we get 8 with a remainder of 10.
Record the quotient 8 as the next digit in the result. 
Result so far: 78.0
If we take 4072 away from 4082, we end up with 10.
Append the next digit (8) from the dividend to 10 and continue with: 108 / 509

Step 6:
509 can be fit into 108 0 times, resulting in a remainder of 108.
The number 0 becomes the next digit in our result. 
Result so far: 780.0
The remainder is 108 after subtracting 0 from 108.
Take the next digit (1) from the dividend and append it to 108, then repeat: 1081 / 509

On to step 7:
509 goes into 1081 2 times with a remainder of 63.
Record the quotient 2 as the next digit in the result. 
Result so far: 7802.0
If we subtract 1018 from 1081, we get 63.
Bring next digit (1) of the dividend behind the 63 and repeat the process: 631 / 509

Advancing to step 8:
631 divided by 509 is 1 with a remainder of 122.
The next digit of our result is 1. 
Result so far: 78021.0
The remainder is 122 after subtracting 509 from 631.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1220, and continue the process.

Let's proceed to step 9:
The number 509 fits into 1220 2 times, leaving a remainder of 202.
Record the quotient 2 as the next digit in the result. 
Result so far: 78021.2
Subtract 1018 from 1220 to get 202.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2020, and continue the process.

Moving on to step 10:
2020 divided by 509 is 3 with a remainder of 493.
Use 3 as the next digit of our solution. 
Result so far: 78021.23
Deduct 1527 from 2020 and we're left with 493.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4930, and continue the process.

Moving on to step 11:
When dividing 4930 by 509, we get 9 with a remainder of 349.
The number 9 becomes the next digit in our result. 
Result so far: 78021.239
Subtract 4581 from 4930 to get 349.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3490, and continue the process.

On to step 12:
When dividing 3490 by 509, we get 6 with a remainder of 436.
Write down 6 as next digit of the result. 
Result so far: 78021.2396
If we take 3054 away from 3490, we end up with 436.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4360, and continue the process.

Moving on to step 13:
509 can be fit into 4360 8 times, resulting in a remainder of 288.
Write down 8 as next digit of the result. 
Result so far: 78021.23968
The remainder is 288 after subtracting 4072 from 4360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2880, and continue the process.

Step 14:
2880 divided by 509 is 5 with a remainder of 335.
Record the quotient 5 as the next digit in the result. 
Result so far: 78021.239685
If we take 2545 away from 2880, we end up with 335.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3350, and continue the process.

Let's proceed to step 15:
The number 509 fits into 3350 6 times, leaving a remainder of 296.
Put 6 as the next digit of the answer. 
Result so far: 78021.2396856
If we subtract 3054 from 3350, we get 296.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2960, and continue the process.

Advancing to step 16:
509 can be fit into 2960 5 times, resulting in a remainder of 415.
Use 5 as the next digit of our solution. 
Result so far: 78021.23968565
Subtract 2545 from 2960 to get 415.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4150, and continue the process.

Our division results in 78021.23968565 with a remaining 4.15e-07.