548240 ÷ 21 
Our goal is to divide 548240 by 21.

On to step 1:
If we divide 5 by 21, we get 0 and a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Take the next digit (4) from the dividend and append it to 5, then repeat: 54 / 21

Advancing to step 2:
The number 21 fits into 54 2 times, leaving a remainder of 12.
The next digit of our result is 2. 
Result so far: 2.0
Subtract 42 from 54 to get 12.
Bring next digit (8) of the dividend behind the 12 and repeat the process: 128 / 21

Let's proceed to step 3:
The number 21 fits into 128 6 times, leaving a remainder of 2.
Record the quotient 6 as the next digit in the result. 
Result so far: 26.0
If we subtract 126 from 128, we get 2.
Take the next digit (2) from the dividend and append it to 2, then repeat: 22 / 21

On to step 4:
21 can be fit into 22 1 times, resulting in a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 261.0
If we subtract 21 from 22, we get 1.
Fetch the next digit (4) from the dividend, attach it to 1 and continue: 14 / 21

Going ahead to step 5:
21 goes into 14 0 times with a remainder of 14.
Put 0 as the next digit of the answer. 
Result so far: 2610.0
If we subtract 0 from 14, we get 14.
Fetch the next digit (0) from the dividend, attach it to 14 and continue: 140 / 21

On to step 6:
When dividing 140 by 21, we get 6 with a remainder of 14.
Record the quotient 6 as the next digit in the result. 
Result so far: 26106.0
Subtract 126 from 140 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 7:
21 goes into 140 6 times with a remainder of 14.
Record the quotient 6 as the next digit in the result. 
Result so far: 26106.6
The remainder is 14 after subtracting 126 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 8:
140 divided by 21 is 6 with a remainder of 14.
Use 6 as the next digit of our solution. 
Result so far: 26106.66
Subtracting 126 from 140 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

After the division, we end up with 26106.66 and a remainder of 0.014.