We're dividing 478807 by 90 
We want to figure out the number of times 478807 can be divided by 90.

Step 1:
90 can be fit into 4 0 times, resulting in a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Append the next digit (7) from the dividend to 4 and continue with: 47 / 90

Going ahead to step 2:
47 divided by 90 is 0 with a remainder of 47.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 47 after subtracting 0 from 47.
Bring next digit (8) of the dividend behind the 47 and repeat the process: 478 / 90

On to step 3:
If we divide 478 by 90, we get 5 and a remainder of 28.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
Deduct 450 from 478 and we're left with 28.
Append the next digit (8) from the dividend to 28 and continue with: 288 / 90

Moving on to step 4:
90 goes into 288 3 times with a remainder of 18.
Put 3 as the next digit of the answer. 
Result so far: 53.0
Deduct 270 from 288 and we're left with 18.
Bring next digit (0) of the dividend behind the 18 and repeat the process: 180 / 90

Let's proceed to step 5:
90 goes into 180 2 times with a remainder of 0.
The next digit of our result is 2. 
Result so far: 532.0
Subtracting 180 from 180 leaves us with 0.
Bring next digit (7) of the dividend behind the 0 and repeat the process: 7 / 90

On to step 6:
When dividing 7 by 90, we get 0 with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 5320.0
The remainder is 7 after subtracting 0 from 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 7:
70 divided by 90 is 0 with a remainder of 70.
Write down 0 as next digit of the result. 
Result so far: 5320.0
Subtracting 0 from 70 leaves us with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

On to step 8:
The number 90 fits into 700 7 times, leaving a remainder of 70.
The number 7 becomes the next digit in our result. 
Result so far: 5320.07
Subtracting 630 from 700 leaves us with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Step 9:
If we divide 700 by 90, we get 7 and a remainder of 70.
Record the quotient 7 as the next digit in the result. 
Result so far: 5320.077
The remainder is 70 after subtracting 630 from 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

After the division, we end up with 5320.077 and a remainder of 0.007.