We're dividing 90172689 by 215 
Our goal is to divide 90172689 by 215.

Moving on to step 1:
215 goes into 9 0 times with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Fetch the next digit (0) from the dividend, attach it to 9 and continue: 90 / 215

Moving on to step 2:
If we divide 90 by 215, we get 0 and a remainder of 90.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 90, we get 90.
Fetch the next digit (1) from the dividend, attach it to 90 and continue: 901 / 215

Going ahead to step 3:
215 goes into 901 4 times with a remainder of 41.
Put 4 as the next digit of the answer. 
Result so far: 4.0
If we subtract 860 from 901, we get 41.
Bring next digit (7) of the dividend behind the 41 and repeat the process: 417 / 215

On to step 4:
If we divide 417 by 215, we get 1 and a remainder of 202.
Record the quotient 1 as the next digit in the result. 
Result so far: 41.0
If we take 215 away from 417, we end up with 202.
Include the next digit (2) from the dividend after 202, then repeat: 2022 / 215

Advancing to step 5:
215 can be fit into 2022 9 times, resulting in a remainder of 87.
Use 9 as the next digit of our solution. 
Result so far: 419.0
If we take 1935 away from 2022, we end up with 87.
Include the next digit (6) from the dividend after 87, then repeat: 876 / 215

Let's proceed to step 6:
If we divide 876 by 215, we get 4 and a remainder of 16.
Write down 4 as next digit of the result. 
Result so far: 4194.0
Deduct 860 from 876 and we're left with 16.
Take the next digit (8) from the dividend and append it to 16, then repeat: 168 / 215

Advancing to step 7:
215 can be fit into 168 0 times, resulting in a remainder of 168.
Put 0 as the next digit of the answer. 
Result so far: 41940.0
Subtracting 0 from 168 leaves us with 168.
Append the next digit (9) from the dividend to 168 and continue with: 1689 / 215

Going ahead to step 8:
1689 divided by 215 is 7 with a remainder of 184.
Use 7 as the next digit of our solution. 
Result so far: 419407.0
Subtracting 1505 from 1689 leaves us with 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

On to step 9:
The number 215 fits into 1840 8 times, leaving a remainder of 120.
The number 8 becomes the next digit in our result. 
Result so far: 419407.8
Subtracting 1720 from 1840 leaves us with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Step 10:
215 goes into 1200 5 times with a remainder of 125.
Use 5 as the next digit of our solution. 
Result so far: 419407.85
If we subtract 1075 from 1200, we get 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

Moving on to step 11:
1250 divided by 215 is 5 with a remainder of 175.
Record the quotient 5 as the next digit in the result. 
Result so far: 419407.855
Subtracting 1075 from 1250 leaves us with 175.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1750, and continue the process.

The final result is 419407.855 with a remainder of 0.0175.