We divide 170728 by 90
Let's see how many times 90 fits into 170728.

Moving on to step 1:
If we divide 1 by 90, we get 0 and a remainder of 1.
Use 0 as the next digit of our solution. 
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 / 90

Moving on to step 2:
When dividing 17 by 90, we get 0 with a remainder of 17.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 17 leaves us with 17.
Include the next digit (0) from the dividend after 17, then repeat: 170 / 90

On to step 3:
When dividing 170 by 90, we get 1 with a remainder of 80.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 90 from 170 to get 80.
Bring next digit (7) of the dividend behind the 80 and repeat the process: 807 / 90

Moving on to step 4:
90 can be fit into 807 8 times, resulting in a remainder of 87.
The next digit of our result is 8. 
Result so far: 18.0
If we subtract 720 from 807, we get 87.
Append the next digit (2) from the dividend to 87 and continue with: 872 / 90

On to step 5:
If we divide 872 by 90, we get 9 and a remainder of 62.
Put 9 as the next digit of the answer. 
Result so far: 189.0
If we subtract 810 from 872, we get 62.
Grab the next digit (8) from the dividend, add it to 62, then carry on: 628 / 90

Let's proceed to step 6:
628 divided by 90 is 6 with a remainder of 88.
The next digit of our result is 6. 
Result so far: 1896.0
Deduct 540 from 628 and we're left with 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Moving on to step 7:
When dividing 880 by 90, we get 9 with a remainder of 70.
Record the quotient 9 as the next digit in the result. 
Result so far: 1896.9
Subtract 810 from 880 to get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Moving on to step 8:
When dividing 700 by 90, we get 7 with a remainder of 70.
Record the quotient 7 as the next digit in the result. 
Result so far: 1896.97
Subtract 630 from 700 to get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Advancing to step 9:
90 can be fit into 700 7 times, resulting in a remainder of 70.
Use 7 as the next digit of our solution. 
Result so far: 1896.977
Subtracting 630 from 700 leaves us with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

The final outcome is 1896.977, with a leftover of 0.007.