We're dividing 861509 by 86 
Let's see how many times 86 fits into 861509.

Moving on to step 1:
The number 86 fits into 8 0 times, leaving a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 86

Going ahead to step 2:
If we divide 86 by 86, we get 1 and a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 86 from 86, we get 0.
Bring next digit (1) of the dividend behind the 0 and repeat the process: 1 / 86

On to step 3:
1 divided by 86 is 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 10.0
If we subtract 0 from 1, we get 1.
Append the next digit (5) from the dividend to 1 and continue with: 15 / 86

Step 4:
If we divide 15 by 86, we get 0 and a remainder of 15.
Use 0 as the next digit of our solution. 
Result so far: 100.0
Subtracting 0 from 15 leaves us with 15.
Take the next digit (0) from the dividend and append it to 15, then repeat: 150 / 86

Let's proceed to step 5:
If we divide 150 by 86, we get 1 and a remainder of 64.
Use 1 as the next digit of our solution. 
Result so far: 1001.0
If we take 86 away from 150, we end up with 64.
Append the next digit (9) from the dividend to 64 and continue with: 649 / 86

Going ahead to step 6:
When dividing 649 by 86, we get 7 with a remainder of 47.
Write down 7 as next digit of the result. 
Result so far: 10017.0
Deduct 602 from 649 and we're left with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Going ahead to step 7:
When dividing 470 by 86, we get 5 with a remainder of 40.
Put 5 as the next digit of the answer. 
Result so far: 10017.5
If we take 430 away from 470, we end up 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.

Let's proceed to step 8:
400 divided by 86 is 4 with a remainder of 56.
Use 4 as the next digit of our solution. 
Result so far: 10017.54
Subtracting 344 from 400 leaves us 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.

On to step 9:
When dividing 560 by 86, we get 6 with a remainder of 44.
The next digit of our result is 6. 
Result so far: 10017.546
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.

Advancing to step 10:
440 divided by 86 is 5 with a remainder of 10.
Write down 5 as next digit of the result. 
Result so far: 10017.5465
Subtract 430 from 440 to 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.

Advancing to step 11:
When dividing 100 by 86, we get 1 with a remainder of 14.
Record the quotient 1 as the next digit in the result. 
Result so far: 10017.54651
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.

Moving on to step 12:
86 can be fit into 140 1 times, resulting in a remainder of 54.
Use 1 as the next digit of our solution. 
Result so far: 10017.546511
Deduct 86 from 140 and we're left with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

The final outcome is 10017.546511, with a leftover of 5.4e-06.