We look at the division of 231599 by 90 
Let's see how many times 90 fits into 231599.

Moving on to step 1:
90 goes into 2 0 times with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Bring next digit (3) of the dividend behind the 2 and repeat the process: 23 / 90

Moving on to step 2:
90 goes into 23 0 times with a remainder of 23.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 23 and we're left with 23.
Append the next digit (1) from the dividend to 23 and continue with: 231 / 90

Step 3:
90 can be fit into 231 2 times, resulting in a remainder of 51.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we take 180 away from 231, we end up with 51.
Fetch the next digit (5) from the dividend, attach it to 51 and continue: 515 / 90

Let's proceed to step 4:
When dividing 515 by 90, we get 5 with a remainder of 65.
Use 5 as the next digit of our solution. 
Result so far: 25.0
If we subtract 450 from 515, we get 65.
Take the next digit (9) from the dividend and append it to 65, then repeat: 659 / 90

Step 5:
659 divided by 90 is 7 with a remainder of 29.
Put 7 as the next digit of the answer. 
Result so far: 257.0
Deduct 630 from 659 and we're left with 29.
Include the next digit (9) from the dividend after 29, then repeat: 299 / 90

Let's proceed to step 6:
90 goes into 299 3 times with a remainder of 29.
Record the quotient 3 as the next digit in the result. 
Result so far: 2573.0
If we subtract 270 from 299, we get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Moving on to step 7:
When dividing 290 by 90, we get 3 with a remainder of 20.
The next digit of our result is 3. 
Result so far: 2573.3
Deduct 270 from 290 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 8:
The number 90 fits into 200 2 times, leaving a remainder of 20.
Write down 2 as next digit of the result. 
Result so far: 2573.32
Subtract 180 from 200 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 9:
The number 90 fits into 200 2 times, leaving a remainder of 20.
Put 2 as the next digit of the answer. 
Result so far: 2573.322
If we subtract 180 from 200, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

In conclusion, the division gives 2573.322 with a balance of 0.002.