We divide 428660 by 90
We want to figure out the number of times 428660 can be divided by 90.

Let's proceed to step 1:
90 goes into 4 0 times with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Include the next digit (2) from the dividend after 4, then repeat: 42 / 90

Step 2:
When dividing 42 by 90, we get 0 with a remainder of 42.
The next digit of our result is 0. 
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

Moving on to step 3:
90 can be fit into 428 4 times, resulting in a remainder of 68.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Subtract 360 from 428 to get 68.
Grab the next digit (6) from the dividend, add it to 68, then carry on: 686 / 90

On to step 4:
90 can be fit into 686 7 times, resulting in a remainder of 56.
The next digit of our result is 7. 
Result so far: 47.0
If we take 630 away from 686, we end up with 56.
Bring next digit (6) of the dividend behind the 56 and repeat the process: 566 / 90

Step 5:
If we divide 566 by 90, we get 6 and a remainder of 26.
Put 6 as the next digit of the answer. 
Result so far: 476.0
The remainder is 26 after subtracting 540 from 566.
Take the next digit (0) from the dividend and append it to 26, then repeat: 260 / 90

Step 6:
The number 90 fits into 260 2 times, leaving a remainder of 80.
Put 2 as the next digit of the answer. 
Result so far: 4762.0
Deduct 180 from 260 and we're left with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Moving on to step 7:
When dividing 800 by 90, we get 8 with a remainder of 80.
Put 8 as the next digit of the answer. 
Result so far: 4762.8
Deduct 720 from 800 and we're left with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Moving on to step 8:
If we divide 800 by 90, we get 8 and a remainder of 80.
The number 8 becomes the next digit in our result. 
Result so far: 4762.88
Subtracting 720 from 800 leaves us with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Our division results in 4762.88 with a remaining 0.08.