We're dividing 815800 by 86 
We want to figure out the number of times 815800 can be divided by 86.

Step 1:
8 divided by 86 is 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 86

Step 2:
When dividing 81 by 86, we get 0 with a remainder of 81.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 81, we get 81.
Grab the next digit (5) from the dividend, add it to 81, then carry on: 815 / 86

Advancing to step 3:
When dividing 815 by 86, we get 9 with a remainder of 41.
The next digit of our result is 9. 
Result so far: 9.0
Subtracting 774 from 815 leaves us with 41.
Append the next digit (8) from the dividend to 41 and continue with: 418 / 86

Advancing to step 4:
86 goes into 418 4 times with a remainder of 74.
Put 4 as the next digit of the answer. 
Result so far: 94.0
Deduct 344 from 418 and we're left with 74.
Fetch the next digit (0) from the dividend, attach it to 74 and continue: 740 / 86

Advancing to step 5:
The number 86 fits into 740 8 times, leaving a remainder of 52.
The number 8 becomes the next digit in our result. 
Result so far: 948.0
The remainder is 52 after subtracting 688 from 740.
Fetch the next digit (0) from the dividend, attach it to 52 and continue: 520 / 86

Moving on to step 6:
If we divide 520 by 86, we get 6 and a remainder of 4.
The next digit of our result is 6. 
Result so far: 9486.0
If we take 516 away from 520, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 7:
If we divide 40 by 86, we get 0 and a remainder of 40.
The next digit of our result is 0. 
Result so far: 9486.0
Deduct 0 from 40 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 8:
The number 86 fits into 400 4 times, leaving a remainder of 56.
Put 4 as the next digit of the answer. 
Result so far: 9486.04
Deduct 344 from 400 and we're left with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Let's proceed to step 9:
When dividing 560 by 86, we get 6 with a remainder of 44.
Record the quotient 6 as the next digit in the result. 
Result so far: 9486.046
Subtracting 516 from 560 leaves us with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Moving on to step 10:
If we divide 440 by 86, we get 5 and a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 9486.0465
If we subtract 430 from 440, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 11:
When dividing 100 by 86, we get 1 with a remainder of 14.
Use 1 as the next digit of our solution. 
Result so far: 9486.04651
Subtracting 86 from 100 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 12:
When dividing 140 by 86, we get 1 with a remainder of 54.
Use 1 as the next digit of our solution. 
Result so far: 9486.046511
Subtract 86 from 140 to get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

In conclusion, the division gives 9486.046511 with a balance of 5.4e-06.