We look at the division of 438529 by 90 
We're looking to find how many times 90 goes into 438529.

Advancing to step 1:
The number 90 fits into 4 0 times, leaving a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Take the next digit (3) from the dividend and append it to 4, then repeat: 43 / 90

Advancing to step 2:
90 can be fit into 43 0 times, resulting in a remainder of 43.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 43, we get 43.
Take the next digit (8) from the dividend and append it to 43, then repeat: 438 / 90

Going ahead to step 3:
If we divide 438 by 90, we get 4 and a remainder of 78.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
The remainder is 78 after subtracting 360 from 438.
Take the next digit (5) from the dividend and append it to 78, then repeat: 785 / 90

On to step 4:
785 divided by 90 is 8 with a remainder of 65.
The next digit of our result is 8. 
Result so far: 48.0
If we take 720 away from 785, we end up with 65.
Grab the next digit (2) from the dividend, add it to 65, then carry on: 652 / 90

Advancing to step 5:
90 can be fit into 652 7 times, resulting in a remainder of 22.
The next digit of our result is 7. 
Result so far: 487.0
The remainder is 22 after subtracting 630 from 652.
Append the next digit (9) from the dividend to 22 and continue with: 229 / 90

On to step 6:
When dividing 229 by 90, we get 2 with a remainder of 49.
Record the quotient 2 as the next digit in the result. 
Result so far: 4872.0
Deduct 180 from 229 and we're left with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Moving on to step 7:
90 goes into 490 5 times with a remainder of 40.
Put 5 as the next digit of the answer. 
Result so far: 4872.5
Deduct 450 from 490 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 8:
If we divide 400 by 90, we get 4 and a remainder of 40.
Put 4 as the next digit of the answer. 
Result so far: 4872.54
If we take 360 away from 400, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 9:
The number 90 fits into 400 4 times, leaving a remainder of 40.
Use 4 as the next digit of our solution. 
Result so far: 4872.544
If we subtract 360 from 400, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

The final result is 4872.544 with a remainder of 0.004.