We're dividing 86411 by 21 
Let's see how many times 21 fits into 86411.

Moving on to step 1:
21 can be fit into 8 0 times, resulting in a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 21

Let's proceed to step 2:
21 can be fit into 86 4 times, resulting in a remainder of 2.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
Subtract 84 from 86 to get 2.
Take the next digit (4) from the dividend and append it to 2, then repeat: 24 / 21

Let's proceed to step 3:
If we divide 24 by 21, we get 1 and a remainder of 3.
The number 1 becomes the next digit in our result. 
Result so far: 41.0
The remainder is 3 after subtracting 21 from 24.
Bring next digit (1) of the dividend behind the 3 and repeat the process: 31 / 21

Advancing to step 4:
31 divided by 21 is 1 with a remainder of 10.
Put 1 as the next digit of the answer. 
Result so far: 411.0
Deduct 21 from 31 and we're left with 10.
Fetch the next digit (1) from the dividend, attach it to 10 and continue: 101 / 21

Going ahead to step 5:
21 goes into 101 4 times with a remainder of 17.
Use 4 as the next digit of our solution. 
Result so far: 4114.0
If we take 84 away from 101, we end up with 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 6:
21 goes into 170 8 times with a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 4114.8
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.

Let's proceed to step 7:
20 divided by 21 is 0 with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 4114.8
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.

Let's proceed to step 8:
200 divided by 21 is 9 with a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 4114.809
If we take 189 away from 200, we end up 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.

Going ahead to step 9:
21 goes into 110 5 times with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 4114.8095
Subtract 105 from 110 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 10:
50 divided by 21 is 2 with a remainder of 8.
The next digit of our result is 2. 
Result so far: 4114.80952
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 11:
21 goes into 80 3 times with a remainder of 17.
The next digit of our result is 3. 
Result so far: 4114.809523
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 12:
21 goes into 170 8 times with a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 4114.8095238
Subtract 168 from 170 to get 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 13:
If we divide 20 by 21, we get 0 and a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 4114.8095238
If we take 0 away from 20, we end up 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.

In conclusion, the division gives 4114.8095238 with a balance of 2e-08.