We look at the division of 90369659 by 521 
We want to figure out the number of times 90369659 can be divided by 521.

Step 1:
521 goes into 9 0 times with a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Include the next digit (0) from the dividend after 9, then repeat: 90 / 521

Advancing to step 2:
521 can be fit into 90 0 times, resulting in a remainder of 90.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 90, we get 90.
Append the next digit (3) from the dividend to 90 and continue with: 903 / 521

Advancing to step 3:
When dividing 903 by 521, we get 1 with a remainder of 382.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 521 away from 903, we end up with 382.
Take the next digit (6) from the dividend and append it to 382, then repeat: 3826 / 521

Moving on to step 4:
If we divide 3826 by 521, we get 7 and a remainder of 179.
Record the quotient 7 as the next digit in the result. 
Result so far: 17.0
If we take 3647 away from 3826, we end up with 179.
Append the next digit (9) from the dividend to 179 and continue with: 1799 / 521

Let's proceed to step 5:
The number 521 fits into 1799 3 times, leaving a remainder of 236.
Record the quotient 3 as the next digit in the result. 
Result so far: 173.0
Subtracting 1563 from 1799 leaves us with 236.
Take the next digit (6) from the dividend and append it to 236, then repeat: 2366 / 521

On to step 6:
If we divide 2366 by 521, we get 4 and a remainder of 282.
Put 4 as the next digit of the answer. 
Result so far: 1734.0
If we take 2084 away from 2366, we end up with 282.
Grab the next digit (5) from the dividend, add it to 282, then carry on: 2825 / 521

Advancing to step 7:
521 goes into 2825 5 times with a remainder of 220.
Record the quotient 5 as the next digit in the result. 
Result so far: 17345.0
If we subtract 2605 from 2825, we get 220.
Bring next digit (9) of the dividend behind the 220 and repeat the process: 2209 / 521

Step 8:
2209 divided by 521 is 4 with a remainder of 125.
Record the quotient 4 as the next digit in the result. 
Result so far: 173454.0
The remainder is 125 after subtracting 2084 from 2209.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

Let's proceed to step 9:
521 can be fit into 1250 2 times, resulting in a remainder of 208.
The next digit of our result is 2. 
Result so far: 173454.2
The remainder is 208 after subtracting 1042 from 1250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

Moving on to step 10:
521 can be fit into 2080 3 times, resulting in a remainder of 517.
The next digit of our result is 3. 
Result so far: 173454.23
The remainder is 517 after subtracting 1563 from 2080.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5170, and continue the process.

Advancing to step 11:
521 goes into 5170 9 times with a remainder of 481.
Record the quotient 9 as the next digit in the result. 
Result so far: 173454.239
Subtract 4689 from 5170 to get 481.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4810, and continue the process.

Let's proceed to step 12:
The number 521 fits into 4810 9 times, leaving a remainder of 121.
The next digit of our result is 9. 
Result so far: 173454.2399
Subtracting 4689 from 4810 leaves us with 121.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1210, and continue the process.

The final result is 173454.2399 with a remainder of 0.00121.