We're dividing 11963839 by 421 
Our goal is to divide 11963839 by 421.

Advancing to step 1:
When dividing 1 by 421, we get 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Fetch the next digit (1) from the dividend, attach it to 1 and continue: 11 / 421

Let's proceed to step 2:
421 can be fit into 11 0 times, resulting in a remainder of 11.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 11, we end up with 11.
Bring next digit (9) of the dividend behind the 11 and repeat the process: 119 / 421

Moving on to step 3:
421 goes into 119 0 times with a remainder of 119.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 119, we end up with 119.
Include the next digit (6) from the dividend after 119, then repeat: 1196 / 421

On to step 4:
421 can be fit into 1196 2 times, resulting in a remainder of 354.
The next digit of our result is 2. 
Result so far: 2.0
Subtracting 842 from 1196 leaves us with 354.
Fetch the next digit (3) from the dividend, attach it to 354 and continue: 3543 / 421

Let's proceed to step 5:
When dividing 3543 by 421, we get 8 with a remainder of 175.
Write down 8 as next digit of the result. 
Result so far: 28.0
If we take 3368 away from 3543, we end up with 175.
Append the next digit (8) from the dividend to 175 and continue with: 1758 / 421

On to step 6:
When dividing 1758 by 421, we get 4 with a remainder of 74.
The next digit of our result is 4. 
Result so far: 284.0
Deduct 1684 from 1758 and we're left with 74.
Fetch the next digit (3) from the dividend, attach it to 74 and continue: 743 / 421

Step 7:
421 can be fit into 743 1 times, resulting in a remainder of 322.
The next digit of our result is 1. 
Result so far: 2841.0
If we take 421 away from 743, we end up with 322.
Bring next digit (9) of the dividend behind the 322 and repeat the process: 3229 / 421

Let's proceed to step 8:
If we divide 3229 by 421, we get 7 and a remainder of 282.
Put 7 as the next digit of the answer. 
Result so far: 28417.0
Subtracting 2947 from 3229 leaves us with 282.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2820, and continue the process.

Moving on to step 9:
421 goes into 2820 6 times with a remainder of 294.
Use 6 as the next digit of our solution. 
Result so far: 28417.6
Deduct 2526 from 2820 and we're left with 294.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2940, and continue the process.

Advancing to step 10:
When dividing 2940 by 421, we get 6 with a remainder of 414.
Write down 6 as next digit of the result. 
Result so far: 28417.66
Subtracting 2526 from 2940 leaves us with 414.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4140, and continue the process.

The final outcome is 28417.66, with a leftover of 0.414.