Let's divide 428520 by 90
Let's see how many times 90 fits into 428520.

Going ahead to step 1:
If we divide 4 by 90, we get 0 and a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Include the next digit (2) from the dividend after 4, then repeat: 42 / 90

Moving on to step 2:
90 can be fit into 42 0 times, resulting in a remainder of 42.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 42 leaves us with 42.
Take the next digit (8) from the dividend and append it to 42, then repeat: 428 / 90

On to step 3:
428 divided by 90 is 4 with a remainder of 68.
The next digit of our result is 4. 
Result so far: 4.0
If we take 360 away from 428, we end up with 68.
Grab the next digit (5) from the dividend, add it to 68, then carry on: 685 / 90

Advancing to step 4:
685 divided by 90 is 7 with a remainder of 55.
Write down 7 as next digit of the result. 
Result so far: 47.0
The remainder is 55 after subtracting 630 from 685.
Fetch the next digit (2) from the dividend, attach it to 55 and continue: 552 / 90

Going ahead to step 5:
When dividing 552 by 90, we get 6 with a remainder of 12.
Use 6 as the next digit of our solution. 
Result so far: 476.0
If we take 540 away from 552, we end up with 12.
Fetch the next digit (0) from the dividend, attach it to 12 and continue: 120 / 90

Let's proceed to step 6:
When dividing 120 by 90, we get 1 with a remainder of 30.
The next digit of our result is 1. 
Result so far: 4761.0
Deduct 90 from 120 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 7:
If we divide 300 by 90, we get 3 and a remainder of 30.
Put 3 as the next digit of the answer. 
Result so far: 4761.3
Deduct 270 from 300 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 8:
When dividing 300 by 90, we get 3 with a remainder of 30.
The number 3 becomes the next digit in our result. 
Result so far: 4761.33
If we take 270 away from 300, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

The final outcome is 4761.33, with a leftover of 0.03.