We look at the division of 524978 by 21 
We're looking to find how many times 21 goes into 524978.

Moving on to step 1:
When dividing 5 by 21, we get 0 with 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.
Fetch the next digit (2) from the dividend, attach it to 5 and continue: 52 / 21

Moving on to step 2:
The number 21 fits into 52 2 times, leaving a remainder of 10.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we take 42 away from 52, we end up with 10.
Take the next digit (4) from the dividend and append it to 10, then repeat: 104 / 21

Advancing to step 3:
The number 21 fits into 104 4 times, leaving a remainder of 20.
Record the quotient 4 as the next digit in the result. 
Result so far: 24.0
If we subtract 84 from 104, we get 20.
Append the next digit (9) from the dividend to 20 and continue with: 209 / 21

Step 4:
21 goes into 209 9 times with a remainder of 20.
Use 9 as the next digit of our solution. 
Result so far: 249.0
If we subtract 189 from 209, we get 20.
Include the next digit (7) from the dividend after 20, then repeat: 207 / 21

Advancing to step 5:
If we divide 207 by 21, we get 9 and a remainder of 18.
The number 9 becomes the next digit in our result. 
Result so far: 2499.0
Deduct 189 from 207 and we're left with 18.
Append the next digit (8) from the dividend to 18 and continue with: 188 / 21

Going ahead to step 6:
188 divided by 21 is 8 with a remainder of 20.
The number 8 becomes the next digit in our result. 
Result so far: 24998.0
Deduct 168 from 188 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 7:
21 goes into 200 9 times with a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 24998.9
The remainder is 11 after subtracting 189 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 8:
When dividing 110 by 21, we get 5 with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 24998.95
Subtracting 105 from 110 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 9:
21 goes into 50 2 times with a remainder of 8.
The next digit of our result is 2. 
Result so far: 24998.952
Subtracting 42 from 50 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 10:
21 can be fit into 80 3 times, resulting in a remainder of 17.
The next digit of our result is 3. 
Result so far: 24998.9523
Subtract 63 from 80 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 11:
170 divided by 21 is 8 with a remainder of 2.
The next digit of our result is 8. 
Result so far: 24998.95238
Deduct 168 from 170 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 12:
20 divided by 21 is 0 with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 24998.95238
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 13:
When dividing 200 by 21, we get 9 with a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 24998.9523809
Deduct 189 from 200 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 14:
If we divide 110 by 21, we get 5 and a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 24998.95238095
Subtracting 105 from 110 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The final result is 24998.95238095 with a remainder of 5e-09.