We look at the division of 183579 by 21 
We're looking to find how many times 21 goes into 183579.

Let's proceed to step 1:
When dividing 1 by 21, we get 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Take the next digit (8) from the dividend and append it to 1, then repeat: 18 / 21

Moving on to step 2:
When dividing 18 by 21, we get 0 with a remainder of 18.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 18 to get 18.
Take the next digit (3) from the dividend and append it to 18, then repeat: 183 / 21

On to step 3:
21 can be fit into 183 8 times, resulting in a remainder of 15.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
The remainder is 15 after subtracting 168 from 183.
Bring next digit (5) of the dividend behind the 15 and repeat the process: 155 / 21

On to step 4:
When dividing 155 by 21, we get 7 with a remainder of 8.
Put 7 as the next digit of the answer. 
Result so far: 87.0
If we take 147 away from 155, we end up with 8.
Append the next digit (7) from the dividend to 8 and continue with: 87 / 21

On to step 5:
87 divided by 21 is 4 with a remainder of 3.
Use 4 as the next digit of our solution. 
Result so far: 874.0
Subtracting 84 from 87 leaves us with 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 21

Moving on to step 6:
The number 21 fits into 39 1 times, leaving a remainder of 18.
Use 1 as the next digit of our solution. 
Result so far: 8741.0
If we subtract 21 from 39, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 7:
If we divide 180 by 21, we get 8 and a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 8741.8
Deduct 168 from 180 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 8:
The number 21 fits into 120 5 times, leaving a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 8741.85
Subtract 105 from 120 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 9:
If we divide 150 by 21, we get 7 and a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 8741.857
If we subtract 147 from 150, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 10:
21 goes into 30 1 times with a remainder of 9.
The next digit of our result is 1. 
Result so far: 8741.8571
Subtract 21 from 30 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 11:
The number 21 fits into 90 4 times, leaving a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 8741.85714
Deduct 84 from 90 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 12:
21 goes into 60 2 times with a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 8741.857142
If we subtract 42 from 60, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 13:
When dividing 180 by 21, we get 8 with a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 8741.8571428
The remainder is 12 after subtracting 168 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 14:
21 can be fit into 120 5 times, resulting in a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 8741.85714285
Subtract 105 from 120 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

The final result is 8741.85714285 with a remainder of 1.5e-08.