We divide 3991308 by 90
We're looking to find how many times 90 goes into 3991308.

Moving on to step 1:
90 can be fit into 3 0 times, resulting in a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 90

Let's proceed to step 2:
When dividing 39 by 90, we get 0 with a remainder of 39.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 39 leaves us with 39.
Include the next digit (9) from the dividend after 39, then repeat: 399 / 90

Moving on to step 3:
90 goes into 399 4 times with a remainder of 39.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtract 360 from 399 to get 39.
Bring next digit (1) of the dividend behind the 39 and repeat the process: 391 / 90

Moving on to step 4:
90 can be fit into 391 4 times, resulting in a remainder of 31.
Use 4 as the next digit of our solution. 
Result so far: 44.0
If we subtract 360 from 391, we get 31.
Include the next digit (3) from the dividend after 31, then repeat: 313 / 90

Let's proceed to step 5:
90 goes into 313 3 times with a remainder of 43.
The next digit of our result is 3. 
Result so far: 443.0
If we take 270 away from 313, we end up with 43.
Fetch the next digit (0) from the dividend, attach it to 43 and continue: 430 / 90

Going ahead to step 6:
90 can be fit into 430 4 times, resulting in a remainder of 70.
Use 4 as the next digit of our solution. 
Result so far: 4434.0
If we take 360 away from 430, we end up with 70.
Append the next digit (8) from the dividend to 70 and continue with: 708 / 90

Moving on to step 7:
The number 90 fits into 708 7 times, leaving a remainder of 78.
Record the quotient 7 as the next digit in the result. 
Result so far: 44347.0
If we take 630 away from 708, we end up with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

On to step 8:
When dividing 780 by 90, we get 8 with a remainder of 60.
The next digit of our result is 8. 
Result so far: 44347.8
Subtract 720 from 780 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 9:
600 divided by 90 is 6 with a remainder of 60.
Write down 6 as next digit of the result. 
Result so far: 44347.86
The remainder is 60 after subtracting 540 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 10:
600 divided by 90 is 6 with a remainder of 60.
Use 6 as the next digit of our solution. 
Result so far: 44347.866
Subtract 540 from 600 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

In conclusion, the division gives 44347.866 with a balance of 0.006.