We divide 172091 by 31
Our goal is to divide 172091 by 31.

Let's proceed to step 1:
31 goes into 1 0 times with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Grab the next digit (7) from the dividend, add it to 1, then carry on: 17 / 31

Moving on to step 2:
17 divided by 31 is 0 with a remainder of 17.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 17 to get 17.
Bring next digit (2) of the dividend behind the 17 and repeat the process: 172 / 31

Moving on to step 3:
The number 31 fits into 172 5 times, leaving a remainder of 17.
Put 5 as the next digit of the answer. 
Result so far: 5.0
If we subtract 155 from 172, we get 17.
Append the next digit (0) from the dividend to 17 and continue with: 170 / 31

Going ahead to step 4:
The number 31 fits into 170 5 times, leaving a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 55.0
If we take 155 away from 170, we end up with 15.
Take the next digit (9) from the dividend and append it to 15, then repeat: 159 / 31

Advancing to step 5:
31 can be fit into 159 5 times, resulting in a remainder of 4.
The next digit of our result is 5. 
Result so far: 555.0
The remainder is 4 after subtracting 155 from 159.
Grab the next digit (1) from the dividend, add it to 4, then carry on: 41 / 31

Advancing to step 6:
The number 31 fits into 41 1 times, leaving a remainder of 10.
Put 1 as the next digit of the answer. 
Result so far: 5551.0
Deduct 31 from 41 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 7:
31 can be fit into 100 3 times, resulting in a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 5551.3
The remainder is 7 after subtracting 93 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Moving on to step 8:
If we divide 70 by 31, we get 2 and a remainder of 8.
The next digit of our result is 2. 
Result so far: 5551.32
Deduct 62 from 70 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 9:
31 can be fit into 80 2 times, resulting in a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 5551.322
If we subtract 62 from 80, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

After the division, we end up with 5551.322 and a remainder of 0.0018.