We look at the division of 12144 by 31 
We're looking to find how many times 31 goes into 12144.

Step 1:
When dividing 1 by 31, we get 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 31

Let's proceed to step 2:
The number 31 fits into 12 0 times, leaving a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 12, we end up with 12.
Include the next digit (1) from the dividend after 12, then repeat: 121 / 31

Moving on to step 3:
The number 31 fits into 121 3 times, leaving a remainder of 28.
Write down 3 as next digit of the result. 
Result so far: 3.0
Subtracting 93 from 121 leaves us with 28.
Fetch the next digit (4) from the dividend, attach it to 28 and continue: 284 / 31

Advancing to step 4:
When dividing 284 by 31, we get 9 with a remainder of 5.
Write down 9 as next digit of the result. 
Result so far: 39.0
If we take 279 away from 284, we end up with 5.
Include the next digit (4) from the dividend after 5, then repeat: 54 / 31

Advancing to step 5:
If we divide 54 by 31, we get 1 and a remainder of 23.
Write down 1 as next digit of the result. 
Result so far: 391.0
Subtract 31 from 54 to get 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Advancing to step 6:
If we divide 230 by 31, we get 7 and a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 391.7
If we subtract 217 from 230, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Moving on to step 7:
130 divided by 31 is 4 with a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 391.74
Deduct 124 from 130 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 8:
31 can be fit into 60 1 times, resulting in a remainder of 29.
Record the quotient 1 as the next digit in the result. 
Result so far: 391.741
If we take 31 away from 60, we end up with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Let's proceed to step 9:
If we divide 290 by 31, we get 9 and a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 391.7419
Subtract 279 from 290 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Moving on to step 10:
110 divided by 31 is 3 with a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 391.74193
Subtract 93 from 110 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.

Moving on to step 11:
If we divide 170 by 31, we get 5 and a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 391.741935
Subtract 155 from 170 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.

On to step 12:
The number 31 fits into 150 4 times, leaving a remainder of 26.
Put 4 as the next digit of the answer. 
Result so far: 391.7419354
Subtracting 124 from 150 leaves us with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Step 13:
If we divide 260 by 31, we get 8 and a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 391.74193548
If we take 248 away from 260, we end up 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.

The final result is 391.74193548 with a remainder of 1.2e-08.