We look at the division of 478087 by 21 
Let's see how many times 21 fits into 478087.

Advancing to step 1:
21 can be fit into 4 0 times, resulting in a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Include the next digit (7) from the dividend after 4, then repeat: 47 / 21

Moving on to step 2:
47 divided by 21 is 2 with a remainder of 5.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtract 42 from 47 to get 5.
Include the next digit (8) from the dividend after 5, then repeat: 58 / 21

Moving on to step 3:
When dividing 58 by 21, we get 2 with a remainder of 16.
The number 2 becomes the next digit in our result. 
Result so far: 22.0
Deduct 42 from 58 and we're left with 16.
Grab the next digit (0) from the dividend, add it to 16, then carry on: 160 / 21

On to step 4:
21 can be fit into 160 7 times, resulting in a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 227.0
Subtracting 147 from 160 leaves us with 13.
Bring next digit (8) of the dividend behind the 13 and repeat the process: 138 / 21

On to step 5:
When dividing 138 by 21, we get 6 with a remainder of 12.
Write down 6 as next digit of the result. 
Result so far: 2276.0
Subtract 126 from 138 to get 12.
Fetch the next digit (7) from the dividend, attach it to 12 and continue: 127 / 21

On to step 6:
The number 21 fits into 127 6 times, leaving a remainder of 1.
Write down 6 as next digit of the result. 
Result so far: 22766.0
If we take 126 away from 127, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 7:
If we divide 10 by 21, we get 0 and a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 22766.0
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 8:
The number 21 fits into 100 4 times, leaving a remainder of 16.
Use 4 as the next digit of our solution. 
Result so far: 22766.04
If we take 84 away from 100, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Advancing to step 9:
When dividing 160 by 21, we get 7 with a remainder of 13.
Record the quotient 7 as the next digit in the result. 
Result so far: 22766.047
Deduct 147 from 160 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Let's proceed to step 10:
The number 21 fits into 130 6 times, leaving a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 22766.0476
If we take 126 away from 130, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 11:
40 divided by 21 is 1 with a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 22766.04761
The remainder is 19 after subtracting 21 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 12:
If we divide 190 by 21, we get 9 and a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 22766.047619
Subtracting 189 from 190 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 13:
21 can be fit into 10 0 times, resulting in a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 22766.047619
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 14:
When dividing 100 by 21, we get 4 with a remainder of 16.
The next digit of our result is 4. 
Result so far: 22766.04761904
The remainder is 16 after subtracting 84 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Our division results in 22766.04761904 with a remaining 1.6e-08.