We look at the division of 172116 by 86 
We're looking to find how many times 86 goes into 172116.

On to step 1:
1 divided by 86 is 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Append the next digit (7) from the dividend to 1 and continue with: 17 / 86

Going ahead to step 2:
The number 86 fits into 17 0 times, leaving a remainder of 17.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 17, we end up with 17.
Take the next digit (2) from the dividend and append it to 17, then repeat: 172 / 86

Advancing to step 3:
The number 86 fits into 172 2 times, leaving a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Deduct 172 from 172 and we're left with 0.
Fetch the next digit (1) from the dividend, attach it to 0 and continue: 1 / 86

On to step 4:
86 can be fit into 1 0 times, resulting in a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 20.0
If we take 0 away from 1, we end up with 1.
Take the next digit (1) from the dividend and append it to 1, then repeat: 11 / 86

Let's proceed to step 5:
If we divide 11 by 86, we get 0 and a remainder of 11.
Record the quotient 0 as the next digit in the result. 
Result so far: 200.0
Deduct 0 from 11 and we're left with 11.
Fetch the next digit (6) from the dividend, attach it to 11 and continue: 116 / 86

Moving on to step 6:
116 divided by 86 is 1 with a remainder of 30.
Use 1 as the next digit of our solution. 
Result so far: 2001.0
If we take 86 away from 116, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 7:
The number 86 fits into 300 3 times, leaving a remainder of 42.
Put 3 as the next digit of the answer. 
Result so far: 2001.3
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 8:
When dividing 420 by 86, we get 4 with a remainder of 76.
Write down 4 as next digit of the result. 
Result so far: 2001.34
Subtracting 344 from 420 leaves us with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Step 9:
The number 86 fits into 760 8 times, leaving a remainder of 72.
Use 8 as the next digit of our solution. 
Result so far: 2001.348
Subtracting 688 from 760 leaves us with 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 10:
720 divided by 86 is 8 with a remainder of 32.
The number 8 becomes the next digit in our result. 
Result so far: 2001.3488
The remainder is 32 after subtracting 688 from 720.
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 2001.3488 and a remainder of 0.00032.