We're dividing 472423 by 21 
We want to figure out the number of times 472423 can be divided by 21.

On to step 1:
21 can be fit into 4 0 times, resulting in a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Fetch the next digit (7) from the dividend, attach it to 4 and continue: 47 / 21

Let's proceed to step 2:
21 can be fit into 47 2 times, resulting in a remainder of 5.
Put 2 as the next digit of the answer. 
Result so far: 2.0
The remainder is 5 after subtracting 42 from 47.
Bring next digit (2) of the dividend behind the 5 and repeat the process: 52 / 21

Step 3:
21 can be fit into 52 2 times, resulting in a remainder of 10.
Record the quotient 2 as the next digit in the result. 
Result so far: 22.0
If we subtract 42 from 52, we get 10.
Grab the next digit (4) from the dividend, add it to 10, then carry on: 104 / 21

Step 4:
If we divide 104 by 21, we get 4 and a remainder of 20.
Write down 4 as next digit of the result. 
Result so far: 224.0
The remainder is 20 after subtracting 84 from 104.
Fetch the next digit (2) from the dividend, attach it to 20 and continue: 202 / 21

Let's proceed to step 5:
If we divide 202 by 21, we get 9 and a remainder of 13.
The next digit of our result is 9. 
Result so far: 2249.0
If we take 189 away from 202, we end up with 13.
Fetch the next digit (3) from the dividend, attach it to 13 and continue: 133 / 21

Let's proceed to step 6:
If we divide 133 by 21, we get 6 and a remainder of 7.
Use 6 as the next digit of our solution. 
Result so far: 22496.0
Subtracting 126 from 133 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 7:
21 goes into 70 3 times with a remainder of 7.
Record the quotient 3 as the next digit in the result. 
Result so far: 22496.3
Subtract 63 from 70 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 8:
The number 21 fits into 70 3 times, leaving a remainder of 7.
The next digit of our result is 3. 
Result so far: 22496.33
Subtract 63 from 70 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

In conclusion, the division gives 22496.33 with a balance of 0.007.