We look at the division of 424131 by 12 
Let's see how many times 12 fits into 424131.

Step 1:
The number 12 fits into 4 0 times, leaving a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Grab the next digit (2) from the dividend, add it to 4, then carry on: 42 / 12

Going ahead to step 2:
12 can be fit into 42 3 times, resulting in a remainder of 6.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Deduct 36 from 42 and we're left with 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 12

Moving on to step 3:
12 goes into 64 5 times with a remainder of 4.
Put 5 as the next digit of the answer. 
Result so far: 35.0
Subtract 60 from 64 to get 4.
Include the next digit (1) from the dividend after 4, then repeat: 41 / 12

Moving on to step 4:
12 goes into 41 3 times with a remainder of 5.
Put 3 as the next digit of the answer. 
Result so far: 353.0
If we take 36 away from 41, we end up with 5.
Grab the next digit (3) from the dividend, add it to 5, then carry on: 53 / 12

On to step 5:
When dividing 53 by 12, we get 4 with a remainder of 5.
The next digit of our result is 4. 
Result so far: 3534.0
If we take 48 away from 53, we end up with 5.
Include the next digit (1) from the dividend after 5, then repeat: 51 / 12

Let's proceed to step 6:
If we divide 51 by 12, we get 4 and a remainder of 3.
Record the quotient 4 as the next digit in the result. 
Result so far: 35344.0
If we subtract 48 from 51, 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 7:
The number 12 fits into 30 2 times, leaving a remainder of 6.
The number 2 becomes the next digit in our result. 
Result so far: 35344.2
Subtracting 24 from 30 leaves us 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.

On to step 8:
12 can be fit into 60 5 times, resulting in a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 35344.25
Subtract 60 from 60 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 9:
12 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 35344.25
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 10:
If we divide 0 by 12, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 35344.25
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 35344.25, with a leftover of 0.0.