Let's divide 172538 by 90
We're looking to find how many times 90 goes into 172538.

Moving on to step 1:
The number 90 fits into 1 0 times, leaving a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Append the next digit (7) from the dividend to 1 and continue with: 17 / 90

On to step 2:
When dividing 17 by 90, we get 0 with a remainder of 17.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 17, we get 17.
Grab the next digit (2) from the dividend, add it to 17, then carry on: 172 / 90

Moving on to step 3:
The number 90 fits into 172 1 times, leaving a remainder of 82.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 90 from 172 leaves us with 82.
Bring next digit (5) of the dividend behind the 82 and repeat the process: 825 / 90

Moving on to step 4:
If we divide 825 by 90, we get 9 and a remainder of 15.
Use 9 as the next digit of our solution. 
Result so far: 19.0
Subtracting 810 from 825 leaves us with 15.
Fetch the next digit (3) from the dividend, attach it to 15 and continue: 153 / 90

Let's proceed to step 5:
153 divided by 90 is 1 with a remainder of 63.
Write down 1 as next digit of the result. 
Result so far: 191.0
Subtracting 90 from 153 leaves us with 63.
Append the next digit (8) from the dividend to 63 and continue with: 638 / 90

Going ahead to step 6:
90 can be fit into 638 7 times, resulting in a remainder of 8.
Put 7 as the next digit of the answer. 
Result so far: 1917.0
Deduct 630 from 638 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.

Advancing to step 7:
The number 90 fits into 80 0 times, leaving a remainder of 80.
Write down 0 as next digit of the result. 
Result so far: 1917.0
If we take 0 away from 80, we end up with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Moving on to step 8:
When dividing 800 by 90, we get 8 with a remainder of 80.
Use 8 as the next digit of our solution. 
Result so far: 1917.08
If we take 720 away from 800, we end up with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Moving on to step 9:
When dividing 800 by 90, we get 8 with a remainder of 80.
Write down 8 as next digit of the result. 
Result so far: 1917.088
If we subtract 720 from 800, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

The final outcome is 1917.088, with a leftover of 0.008.