We look at the division of 4172939 by 243 
We want to divide 4172939 by 243.

Let's proceed to step 1:
243 can be fit into 4 0 times, resulting in a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Bring next digit (1) of the dividend behind the 4 and repeat the process: 41 / 243

On to step 2:
243 can be fit into 41 0 times, resulting in a remainder of 41.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 41 and we're left with 41.
Include the next digit (7) from the dividend after 41, then repeat: 417 / 243

Advancing to step 3:
When dividing 417 by 243, we get 1 with a remainder of 174.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 243 from 417 and we're left with 174.
Take the next digit (2) from the dividend and append it to 174, then repeat: 1742 / 243

Going ahead to step 4:
243 can be fit into 1742 7 times, resulting in a remainder of 41.
Use 7 as the next digit of our solution. 
Result so far: 17.0
Deduct 1701 from 1742 and we're left with 41.
Append the next digit (9) from the dividend to 41 and continue with: 419 / 243

Advancing to step 5:
243 goes into 419 1 times with a remainder of 176.
The next digit of our result is 1. 
Result so far: 171.0
If we subtract 243 from 419, we get 176.
Take the next digit (3) from the dividend and append it to 176, then repeat: 1763 / 243

Going ahead to step 6:
If we divide 1763 by 243, we get 7 and a remainder of 62.
Record the quotient 7 as the next digit in the result. 
Result so far: 1717.0
If we subtract 1701 from 1763, we get 62.
Bring next digit (9) of the dividend behind the 62 and repeat the process: 629 / 243

Going ahead to step 7:
243 goes into 629 2 times with a remainder of 143.
The next digit of our result is 2. 
Result so far: 17172.0
Subtracting 486 from 629 leaves us with 143.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1430, and continue the process.

Moving on to step 8:
If we divide 1430 by 243, we get 5 and a remainder of 215.
Record the quotient 5 as the next digit in the result. 
Result so far: 17172.5
If we take 1215 away from 1430, we end up with 215.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2150, and continue the process.

Advancing to step 9:
If we divide 2150 by 243, we get 8 and a remainder of 206.
Use 8 as the next digit of our solution. 
Result so far: 17172.58
If we subtract 1944 from 2150, we get 206.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2060, and continue the process.

Moving on to step 10:
The number 243 fits into 2060 8 times, leaving a remainder of 116.
Write down 8 as next digit of the result. 
Result so far: 17172.588
If we subtract 1944 from 2060, we get 116.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1160, and continue the process.

The quotient of the division is 17172.588, and the remainder is 0.0116.