We look at the division of 891286 by 21 
Our goal is to divide 891286 by 21.

Moving on to step 1:
21 can be fit into 8 0 times, resulting in a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Bring next digit (9) of the dividend behind the 8 and repeat the process: 89 / 21

Going ahead to step 2:
89 divided by 21 is 4 with a remainder of 5.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
If we take 84 away from 89, we end up with 5.
Append the next digit (1) from the dividend to 5 and continue with: 51 / 21

On to step 3:
21 can be fit into 51 2 times, resulting in a remainder of 9.
The number 2 becomes the next digit in our result. 
Result so far: 42.0
Deduct 42 from 51 and we're left with 9.
Grab the next digit (2) from the dividend, add it to 9, then carry on: 92 / 21

Going ahead to step 4:
If we divide 92 by 21, we get 4 and a remainder of 8.
The number 4 becomes the next digit in our result. 
Result so far: 424.0
Subtracting 84 from 92 leaves us with 8.
Bring next digit (8) of the dividend behind the 8 and repeat the process: 88 / 21

Step 5:
If we divide 88 by 21, we get 4 and a remainder of 4.
The number 4 becomes the next digit in our result. 
Result so far: 4244.0
Subtract 84 from 88 to get 4.
Include the next digit (6) from the dividend after 4, then repeat: 46 / 21

Moving on to step 6:
21 can be fit into 46 2 times, resulting in a remainder of 4.
The number 2 becomes the next digit in our result. 
Result so far: 42442.0
If we subtract 42 from 46, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 7:
21 can be fit into 40 1 times, resulting in a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 42442.1
Subtract 21 from 40 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 8:
The number 21 fits into 190 9 times, leaving a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 42442.19
Subtract 189 from 190 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 9:
If we divide 10 by 21, we get 0 and a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 42442.19
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 10:
When dividing 100 by 21, we get 4 with a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 42442.1904
Deduct 84 from 100 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 11:
When dividing 160 by 21, we get 7 with a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 42442.19047
The remainder is 13 after subtracting 147 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Advancing to step 12:
The number 21 fits into 130 6 times, leaving a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 42442.190476
If we subtract 126 from 130, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 13:
When dividing 40 by 21, we get 1 with a remainder of 19.
The next digit of our result is 1. 
Result so far: 42442.1904761
Deduct 21 from 40 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 14:
If we divide 190 by 21, we get 9 and a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 42442.19047619
If we subtract 189 from 190, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

The final outcome is 42442.19047619, with a leftover of 1e-09.