We're dividing 488107 by 21 
Let's see how many times 21 fits into 488107.

Step 1:
4 divided by 21 is 0 with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Fetch the next digit (8) from the dividend, attach it to 4 and continue: 48 / 21

Advancing to step 2:
The number 21 fits into 48 2 times, leaving a remainder of 6.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we subtract 42 from 48, we get 6.
Bring next digit (8) of the dividend behind the 6 and repeat the process: 68 / 21

Let's proceed to step 3:
68 divided by 21 is 3 with a remainder of 5.
Record the quotient 3 as the next digit in the result. 
Result so far: 23.0
If we subtract 63 from 68, we get 5.
Take the next digit (1) from the dividend and append it to 5, then repeat: 51 / 21

Going ahead to step 4:
The number 21 fits into 51 2 times, leaving a remainder of 9.
The next digit of our result is 2. 
Result so far: 232.0
Subtract 42 from 51 to get 9.
Include the next digit (0) from the dividend after 9, then repeat: 90 / 21

On to step 5:
21 goes into 90 4 times with a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 2324.0
The remainder is 6 after subtracting 84 from 90.
Append the next digit (7) from the dividend to 6 and continue with: 67 / 21

On to step 6:
21 can be fit into 67 3 times, resulting in a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 23243.0
Deduct 63 from 67 and we're left 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.

Let's proceed to step 7:
21 can be fit into 40 1 times, resulting in a remainder of 19.
The next digit of our result is 1. 
Result so far: 23243.1
Deduct 21 from 40 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 8:
The number 21 fits into 190 9 times, leaving a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 23243.19
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.

Step 9:
21 can be fit into 10 0 times, resulting in a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 23243.19
If we subtract 0 from 10, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 10:
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: 23243.1904
Deduct 84 from 100 and we're left 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.

Going ahead to step 11:
The number 21 fits into 160 7 times, leaving a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 23243.19047
Subtracting 147 from 160 leaves us 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.

Moving on to step 12:
21 can be fit into 130 6 times, resulting in a remainder of 4.
The next digit of our result is 6. 
Result so far: 23243.190476
The remainder is 4 after subtracting 126 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 13:
When dividing 40 by 21, we get 1 with a remainder of 19.
Record the quotient 1 as the next digit in the result. 
Result so far: 23243.1904761
Subtracting 21 from 40 leaves us with 19.
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 14:
If we divide 190 by 21, we get 9 and a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 23243.19047619
Subtract 189 from 190 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

In conclusion, the division gives 23243.19047619 with a balance of 1e-09.