We look at the division of 171839 by 86 
Let's see how many times 86 fits into 171839.

Going ahead to step 1:
The number 86 fits into 1 0 times, leaving a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Take the next digit (7) from the dividend and append it to 1, then repeat: 17 / 86

Moving on to step 2:
86 can be fit into 17 0 times, resulting in a remainder of 17.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 17, we end up with 17.
Bring next digit (1) of the dividend behind the 17 and repeat the process: 171 / 86

Going ahead to step 3:
If we divide 171 by 86, we get 1 and a remainder of 85.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 86 from 171 and we're left with 85.
Grab the next digit (8) from the dividend, add it to 85, then carry on: 858 / 86

Moving on to step 4:
86 goes into 858 9 times with a remainder of 84.
The number 9 becomes the next digit in our result. 
Result so far: 19.0
Subtract 774 from 858 to get 84.
Take the next digit (3) from the dividend and append it to 84, then repeat: 843 / 86

Advancing to step 5:
The number 86 fits into 843 9 times, leaving a remainder of 69.
Put 9 as the next digit of the answer. 
Result so far: 199.0
Subtract 774 from 843 to get 69.
Bring next digit (9) of the dividend behind the 69 and repeat the process: 699 / 86

On to step 6:
86 can be fit into 699 8 times, resulting in a remainder of 11.
Record the quotient 8 as the next digit in the result. 
Result so far: 1998.0
If we subtract 688 from 699, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 7:
If we divide 110 by 86, we get 1 and a remainder of 24.
Write down 1 as next digit of the result. 
Result so far: 1998.1
If we subtract 86 from 110, we get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Going ahead to step 8:
240 divided by 86 is 2 with a remainder of 68.
Write down 2 as next digit of the result. 
Result so far: 1998.12
Subtract 172 from 240 to get 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

On to step 9:
680 divided by 86 is 7 with a remainder of 78.
The next digit of our result is 7. 
Result so far: 1998.127
Subtract 602 from 680 to get 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Moving on to step 10:
If we divide 780 by 86, we get 9 and a remainder of 6.
Use 9 as the next digit of our solution. 
Result so far: 1998.1279
Deduct 774 from 780 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 11:
When dividing 60 by 86, we get 0 with a remainder of 60.
Use 0 as the next digit of our solution. 
Result so far: 1998.1279
Subtract 0 from 60 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 12:
600 divided by 86 is 6 with a remainder of 84.
The next digit of our result is 6. 
Result so far: 1998.127906
If we take 516 away from 600, we end up with 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Advancing to step 13:
When dividing 840 by 86, we get 9 with a remainder of 66.
Use 9 as the next digit of our solution. 
Result so far: 1998.1279069
The remainder is 66 after subtracting 774 from 840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

On to step 14:
When dividing 660 by 86, we get 7 with a remainder of 58.
Write down 7 as next digit of the result. 
Result so far: 1998.12790697
Deduct 602 from 660 and we're left with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

The quotient of the division is 1998.12790697, and the remainder is 5.8e-08.