We're dividing 12783728 by 407 
We want to divide 12783728 by 407.

Let's proceed to step 1:
1 divided by 407 is 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 407

Advancing to step 2:
12 divided by 407 is 0 with a remainder of 12.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 12 and we're left with 12.
Append the next digit (7) from the dividend to 12 and continue with: 127 / 407

Advancing to step 3:
The number 407 fits into 127 0 times, leaving a remainder of 127.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 127 leaves us with 127.
Fetch the next digit (8) from the dividend, attach it to 127 and continue: 1278 / 407

On to step 4:
If we divide 1278 by 407, we get 3 and a remainder of 57.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
The remainder is 57 after subtracting 1221 from 1278.
Bring next digit (3) of the dividend behind the 57 and repeat the process: 573 / 407

Moving on to step 5:
The number 407 fits into 573 1 times, leaving a remainder of 166.
The next digit of our result is 1. 
Result so far: 31.0
The remainder is 166 after subtracting 407 from 573.
Grab the next digit (7) from the dividend, add it to 166, then carry on: 1667 / 407

Let's proceed to step 6:
1667 divided by 407 is 4 with a remainder of 39.
The number 4 becomes the next digit in our result. 
Result so far: 314.0
If we take 1628 away from 1667, we end up with 39.
Bring next digit (2) of the dividend behind the 39 and repeat the process: 392 / 407

Going ahead to step 7:
When dividing 392 by 407, we get 0 with a remainder of 392.
Record the quotient 0 as the next digit in the result. 
Result so far: 3140.0
The remainder is 392 after subtracting 0 from 392.
Append the next digit (8) from the dividend to 392 and continue with: 3928 / 407

Step 8:
407 can be fit into 3928 9 times, resulting in a remainder of 265.
The next digit of our result is 9. 
Result so far: 31409.0
Subtracting 3663 from 3928 leaves us with 265.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2650, and continue the process.

Advancing to step 9:
When dividing 2650 by 407, we get 6 with a remainder of 208.
Use 6 as the next digit of our solution. 
Result so far: 31409.6
The remainder is 208 after subtracting 2442 from 2650.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

On to step 10:
2080 divided by 407 is 5 with a remainder of 45.
Write down 5 as next digit of the result. 
Result so far: 31409.65
The remainder is 45 after subtracting 2035 from 2080.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

On to step 11:
407 can be fit into 450 1 times, resulting in a remainder of 43.
Put 1 as the next digit of the answer. 
Result so far: 31409.651
If we take 407 away from 450, we end up with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Moving on to step 12:
407 can be fit into 430 1 times, resulting in a remainder of 23.
Record the quotient 1 as the next digit in the result. 
Result so far: 31409.6511
Deduct 407 from 430 and we're left with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

The final result is 31409.6511 with a remainder of 0.00023.