We look at the division of 604218 by 21 
We want to divide 604218 by 21.

Advancing to step 1:
When dividing 6 by 21, we get 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Include the next digit (0) from the dividend after 6, then repeat: 60 / 21

Advancing to step 2:
If we divide 60 by 21, we get 2 and a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Deduct 42 from 60 and we're left with 18.
Fetch the next digit (4) from the dividend, attach it to 18 and continue: 184 / 21

Step 3:
21 can be fit into 184 8 times, resulting in a remainder of 16.
Put 8 as the next digit of the answer. 
Result so far: 28.0
The remainder is 16 after subtracting 168 from 184.
Append the next digit (2) from the dividend to 16 and continue with: 162 / 21

On to step 4:
When dividing 162 by 21, we get 7 with a remainder of 15.
Put 7 as the next digit of the answer. 
Result so far: 287.0
Subtracting 147 from 162 leaves us with 15.
Append the next digit (1) from the dividend to 15 and continue with: 151 / 21

On to step 5:
151 divided by 21 is 7 with a remainder of 4.
The next digit of our result is 7. 
Result so far: 2877.0
Subtracting 147 from 151 leaves us with 4.
Take the next digit (8) from the dividend and append it to 4, then repeat: 48 / 21

Let's proceed to step 6:
If we divide 48 by 21, we get 2 and a remainder of 6.
The next digit of our result is 2. 
Result so far: 28772.0
If we subtract 42 from 48, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 7:
60 divided by 21 is 2 with a remainder of 18.
The next digit of our result is 2. 
Result so far: 28772.2
Subtract 42 from 60 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 8:
If we divide 180 by 21, we get 8 and a remainder of 12.
The next digit of our result is 8. 
Result so far: 28772.28
The remainder is 12 after subtracting 168 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 9:
120 divided by 21 is 5 with a remainder of 15.
The next digit of our result is 5. 
Result so far: 28772.285
Deduct 105 from 120 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 10:
150 divided by 21 is 7 with a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 28772.2857
Deduct 147 from 150 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 11:
21 goes into 30 1 times with a remainder of 9.
The next digit of our result is 1. 
Result so far: 28772.28571
Subtracting 21 from 30 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 12:
If we divide 90 by 21, we get 4 and a remainder of 6.
The next digit of our result is 4. 
Result so far: 28772.285714
If we take 84 away from 90, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 13:
The number 21 fits into 60 2 times, leaving a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 28772.2857142
If we subtract 42 from 60, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Advancing to step 14:
21 goes into 180 8 times with a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 28772.28571428
The remainder is 12 after subtracting 168 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The final result is 28772.28571428 with a remainder of 1.2e-08.