We look at the division of 84648309 by 521 
We're looking to find how many times 521 goes into 84648309.

Advancing to step 1:
The number 521 fits into 8 0 times, leaving a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Grab the next digit (4) from the dividend, add it to 8, then carry on: 84 / 521

Advancing to step 2:
521 can be fit into 84 0 times, resulting in a remainder of 84.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 84 and we're left with 84.
Include the next digit (6) from the dividend after 84, then repeat: 846 / 521

Let's proceed to step 3:
521 goes into 846 1 times with a remainder of 325.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 325 after subtracting 521 from 846.
Include the next digit (4) from the dividend after 325, then repeat: 3254 / 521

Going ahead to step 4:
521 can be fit into 3254 6 times, resulting in a remainder of 128.
Record the quotient 6 as the next digit in the result. 
Result so far: 16.0
Deduct 3126 from 3254 and we're left with 128.
Take the next digit (8) from the dividend and append it to 128, then repeat: 1288 / 521

Step 5:
When dividing 1288 by 521, we get 2 with a remainder of 246.
The number 2 becomes the next digit in our result. 
Result so far: 162.0
Subtracting 1042 from 1288 leaves us with 246.
Bring next digit (3) of the dividend behind the 246 and repeat the process: 2463 / 521

Moving on to step 6:
The number 521 fits into 2463 4 times, leaving a remainder of 379.
Write down 4 as next digit of the result. 
Result so far: 1624.0
Subtract 2084 from 2463 to get 379.
Append the next digit (0) from the dividend to 379 and continue with: 3790 / 521

Moving on to step 7:
521 can be fit into 3790 7 times, resulting in a remainder of 143.
Put 7 as the next digit of the answer. 
Result so far: 16247.0
Subtracting 3647 from 3790 leaves us with 143.
Grab the next digit (9) from the dividend, add it to 143, then carry on: 1439 / 521

Going ahead to step 8:
521 goes into 1439 2 times with a remainder of 397.
The number 2 becomes the next digit in our result. 
Result so far: 162472.0
Subtract 1042 from 1439 to get 397.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3970, and continue the process.

Step 9:
521 goes into 3970 7 times with a remainder of 323.
Put 7 as the next digit of the answer. 
Result so far: 162472.7
If we take 3647 away from 3970, we end up with 323.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3230, and continue the process.

Moving on to step 10:
3230 divided by 521 is 6 with a remainder of 104.
Put 6 as the next digit of the answer. 
Result so far: 162472.76
Subtracting 3126 from 3230 leaves us with 104.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

Advancing to step 11:
If we divide 1040 by 521, we get 1 and a remainder of 519.
Write down 1 as next digit of the result. 
Result so far: 162472.761
The remainder is 519 after subtracting 521 from 1040.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5190, and continue the process.

Let's proceed to step 12:
5190 divided by 521 is 9 with a remainder of 501.
Record the quotient 9 as the next digit in the result. 
Result so far: 162472.7619
Deduct 4689 from 5190 and we're left with 501.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5010, and continue the process.

Advancing to step 13:
If we divide 5010 by 521, we get 9 and a remainder of 321.
Record the quotient 9 as the next digit in the result. 
Result so far: 162472.76199
If we take 4689 away from 5010, we end up with 321.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3210, and continue the process.

The final result is 162472.76199 with a remainder of 0.000321.