12738512 divided by 321 
Our goal is to divide 12738512 by 321.

Step 1:
321 can be fit into 1 0 times, resulting in a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 321

Step 2:
321 goes into 12 0 times with a remainder of 12.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 12, we get 12.
Include the next digit (7) from the dividend after 12, then repeat: 127 / 321

Going ahead to step 3:
321 goes into 127 0 times with a remainder of 127.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 127 and we're left with 127.
Append the next digit (3) from the dividend to 127 and continue with: 1273 / 321

Going ahead to step 4:
321 goes into 1273 3 times with a remainder of 310.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Deduct 963 from 1273 and we're left with 310.
Append the next digit (8) from the dividend to 310 and continue with: 3108 / 321

Let's proceed to step 5:
If we divide 3108 by 321, we get 9 and a remainder of 219.
Put 9 as the next digit of the answer. 
Result so far: 39.0
Subtracting 2889 from 3108 leaves us with 219.
Bring next digit (5) of the dividend behind the 219 and repeat the process: 2195 / 321

On to step 6:
The number 321 fits into 2195 6 times, leaving a remainder of 269.
Use 6 as the next digit of our solution. 
Result so far: 396.0
The remainder is 269 after subtracting 1926 from 2195.
Include the next digit (1) from the dividend after 269, then repeat: 2691 / 321

Advancing to step 7:
When dividing 2691 by 321, we get 8 with a remainder of 123.
Use 8 as the next digit of our solution. 
Result so far: 3968.0
Subtracting 2568 from 2691 leaves us with 123.
Take the next digit (2) from the dividend and append it to 123, then repeat: 1232 / 321

Let's proceed to step 8:
When dividing 1232 by 321, we get 3 with a remainder of 269.
The next digit of our result is 3. 
Result so far: 39683.0
The remainder is 269 after subtracting 963 from 1232.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2690, and continue the process.

Let's proceed to step 9:
2690 divided by 321 is 8 with a remainder of 122.
Write down 8 as next digit of the result. 
Result so far: 39683.8
If we subtract 2568 from 2690, we get 122.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1220, and continue the process.

On to step 10:
The number 321 fits into 1220 3 times, leaving a remainder of 257.
The number 3 becomes the next digit in our result. 
Result so far: 39683.83
Subtract 963 from 1220 to get 257.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2570, and continue the process.

Moving on to step 11:
2570 divided by 321 is 8 with a remainder of 2.
The next digit of our result is 8. 
Result so far: 39683.838
The remainder is 2 after subtracting 2568 from 2570.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 12:
20 divided by 321 is 0 with a remainder of 20.
The next digit of our result is 0. 
Result so far: 39683.838
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 13:
If we divide 200 by 321, we get 0 and a remainder of 200.
Write down 0 as next digit of the result. 
Result so far: 39683.838
If we subtract 0 from 200, we get 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

In conclusion, the division gives 39683.838 with a balance of 0.0002.