We're dividing 78515217 by 86 
Let's see how many times 86 fits into 78515217.

Going ahead to step 1:
86 can be fit into 7 0 times, resulting in a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Take the next digit (8) from the dividend and append it to 7, then repeat: 78 / 86

On to step 2:
If we divide 78 by 86, we get 0 and a remainder of 78.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 78, we get 78.
Grab the next digit (5) from the dividend, add it to 78, then carry on: 785 / 86

Advancing to step 3:
785 divided by 86 is 9 with a remainder of 11.
The next digit of our result is 9. 
Result so far: 9.0
Subtract 774 from 785 to get 11.
Bring next digit (1) of the dividend behind the 11 and repeat the process: 111 / 86

On to step 4:
86 goes into 111 1 times with a remainder of 25.
Put 1 as the next digit of the answer. 
Result so far: 91.0
Subtracting 86 from 111 leaves us with 25.
Fetch the next digit (5) from the dividend, attach it to 25 and continue: 255 / 86

Step 5:
When dividing 255 by 86, we get 2 with a remainder of 83.
Record the quotient 2 as the next digit in the result. 
Result so far: 912.0
If we take 172 away from 255, we end up with 83.
Include the next digit (2) from the dividend after 83, then repeat: 832 / 86

On to step 6:
832 divided by 86 is 9 with a remainder of 58.
Write down 9 as next digit of the result. 
Result so far: 9129.0
Subtracting 774 from 832 leaves us with 58.
Take the next digit (1) from the dividend and append it to 58, then repeat: 581 / 86

Moving on to step 7:
If we divide 581 by 86, we get 6 and a remainder of 65.
Write down 6 as next digit of the result. 
Result so far: 91296.0
Deduct 516 from 581 and we're left with 65.
Fetch the next digit (7) from the dividend, attach it to 65 and continue: 657 / 86

Going ahead to step 8:
If we divide 657 by 86, we get 7 and a remainder of 55.
Put 7 as the next digit of the answer. 
Result so far: 912967.0
If we take 602 away from 657, we end up with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Advancing to step 9:
If we divide 550 by 86, we get 6 and a remainder of 34.
Write down 6 as next digit of the result. 
Result so far: 912967.6
If we take 516 away from 550, we end up with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Step 10:
86 can be fit into 340 3 times, resulting in a remainder of 82.
Use 3 as the next digit of our solution. 
Result so far: 912967.63
The remainder is 82 after subtracting 258 from 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Moving on to step 11:
When dividing 820 by 86, we get 9 with a remainder of 46.
Record the quotient 9 as the next digit in the result. 
Result so far: 912967.639
Deduct 774 from 820 and we're left with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Advancing to step 12:
When dividing 460 by 86, we get 5 with a remainder of 30.
The number 5 becomes the next digit in our result. 
Result so far: 912967.6395
If we subtract 430 from 460, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 13:
86 goes into 300 3 times with a remainder of 42.
Use 3 as the next digit of our solution. 
Result so far: 912967.63953
If we take 258 away from 300, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

On to step 14:
When dividing 420 by 86, we get 4 with a remainder of 76.
Record the quotient 4 as the next digit in the result. 
Result so far: 912967.639534
The remainder is 76 after subtracting 344 from 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

On to step 15:
86 can be fit into 760 8 times, resulting in a remainder of 72.
Use 8 as the next digit of our solution. 
Result so far: 912967.6395348
Subtract 688 from 760 to get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Let's proceed to step 16:
When dividing 720 by 86, we get 8 with a remainder of 32.
Write down 8 as next digit of the result. 
Result so far: 912967.63953488
Deduct 688 from 720 and we're left with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

After the division, we end up with 912967.63953488 and a remainder of 3.2e-08.