We look at the division of 878546 by 21 
We want to divide 878546 by 21.

Let's proceed to step 1:
8 divided by 21 is 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Take the next digit (7) from the dividend and append it to 8, then repeat: 87 / 21

Step 2:
If we divide 87 by 21, we get 4 and a remainder of 3.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtract 84 from 87 to get 3.
Take the next digit (8) from the dividend and append it to 3, then repeat: 38 / 21

Step 3:
The number 21 fits into 38 1 times, leaving a remainder of 17.
The number 1 becomes the next digit in our result. 
Result so far: 41.0
If we subtract 21 from 38, we get 17.
Take the next digit (5) from the dividend and append it to 17, then repeat: 175 / 21

Step 4:
175 divided by 21 is 8 with a remainder of 7.
Use 8 as the next digit of our solution. 
Result so far: 418.0
If we take 168 away from 175, we end up with 7.
Include the next digit (4) from the dividend after 7, then repeat: 74 / 21

Moving on to step 5:
21 goes into 74 3 times with a remainder of 11.
The number 3 becomes the next digit in our result. 
Result so far: 4183.0
If we subtract 63 from 74, we get 11.
Append the next digit (6) from the dividend to 11 and continue with: 116 / 21

Going ahead to step 6:
The number 21 fits into 116 5 times, leaving a remainder of 11.
Put 5 as the next digit of the answer. 
Result so far: 41835.0
If we subtract 105 from 116, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 7:
21 can be fit into 110 5 times, resulting in a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 41835.5
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.

Let's proceed to step 8:
When dividing 50 by 21, we get 2 with a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 41835.52
Subtract 42 from 50 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 9:
The number 21 fits into 80 3 times, leaving a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 41835.523
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.

Step 10:
170 divided by 21 is 8 with a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 41835.5238
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.

Going ahead to step 11:
If we divide 20 by 21, we get 0 and a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 41835.5238
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 12:
The number 21 fits into 200 9 times, leaving a remainder of 11.
The next digit of our result is 9. 
Result so far: 41835.523809
Subtracting 189 from 200 leaves us 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.

Advancing to step 13:
If we divide 110 by 21, we get 5 and a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 41835.5238095
Deduct 105 from 110 and we're left 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 14:
21 can be fit into 50 2 times, resulting in a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 41835.52380952
Deduct 42 from 50 and we're left 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.

In conclusion, the division gives 41835.52380952 with a balance of 8e-09.