We're dividing 243421 by 18 
We want to figure out the number of times 243421 can be divided by 18.

Step 1:
18 goes into 2 0 times with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Grab the next digit (4) from the dividend, add it to 2, then carry on: 24 / 18

Step 2:
18 goes into 24 1 times with a remainder of 6.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 18 from 24, we get 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 18

Moving on to step 3:
18 can be fit into 63 3 times, resulting in a remainder of 9.
Write down 3 as next digit of the result. 
Result so far: 13.0
If we subtract 54 from 63, we get 9.
Fetch the next digit (4) from the dividend, attach it to 9 and continue: 94 / 18

Moving on to step 4:
94 divided by 18 is 5 with a remainder of 4.
The next digit of our result is 5. 
Result so far: 135.0
Subtracting 90 from 94 leaves us with 4.
Grab the next digit (2) from the dividend, add it to 4, then carry on: 42 / 18

Step 5:
42 divided by 18 is 2 with a remainder of 6.
Put 2 as the next digit of the answer. 
Result so far: 1352.0
Subtracting 36 from 42 leaves us with 6.
Fetch the next digit (1) from the dividend, attach it to 6 and continue: 61 / 18

Going ahead to step 6:
61 divided by 18 is 3 with a remainder of 7.
Put 3 as the next digit of the answer. 
Result so far: 13523.0
Deduct 54 from 61 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 7:
18 can be fit into 70 3 times, resulting in a remainder of 16.
The number 3 becomes the next digit in our result. 
Result so far: 13523.3
Subtracting 54 from 70 leaves us 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.

Step 8:
If we divide 160 by 18, we get 8 and a remainder of 16.
Record the quotient 8 as the next digit in the result. 
Result so far: 13523.38
If we subtract 144 from 160, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Advancing to step 9:
160 divided by 18 is 8 with a remainder of 16.
Put 8 as the next digit of the answer. 
Result so far: 13523.388
Subtracting 144 from 160 leaves us 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.

In conclusion, the division gives 13523.388 with a balance of 0.0016.