We divide 1243750 by 12
We want to figure out the number of times 1243750 can be divided by 12.

Advancing to step 1:
The number 12 fits into 1 0 times, leaving 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.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 12

Step 2:
12 divided by 12 is 1 with a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 12 from 12 and we're left with 0.
Append the next digit (4) from the dividend to 0 and continue with: 4 / 12

Let's proceed to step 3:
4 divided by 12 is 0 with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 10.0
Subtracting 0 from 4 leaves us with 4.
Bring next digit (3) of the dividend behind the 4 and repeat the process: 43 / 12

Moving on to step 4:
12 can be fit into 43 3 times, resulting in a remainder of 7.
Record the quotient 3 as the next digit in the result. 
Result so far: 103.0
Subtract 36 from 43 to get 7.
Append the next digit (7) from the dividend to 7 and continue with: 77 / 12

On to step 5:
12 goes into 77 6 times with a remainder of 5.
The number 6 becomes the next digit in our result. 
Result so far: 1036.0
Deduct 72 from 77 and we're left with 5.
Grab the next digit (5) from the dividend, add it to 5, then carry on: 55 / 12

On to step 6:
If we divide 55 by 12, we get 4 and a remainder of 7.
Write down 4 as next digit of the result. 
Result so far: 10364.0
If we subtract 48 from 55, we get 7.
Fetch the next digit (0) from the dividend, attach it to 7 and continue: 70 / 12

Step 7:
If we divide 70 by 12, we get 5 and a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 103645.0
If we subtract 60 from 70, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 8:
The number 12 fits into 100 8 times, leaving a remainder of 4.
The next digit of our result is 8. 
Result so far: 103645.8
Subtract 96 from 100 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 9:
When dividing 40 by 12, we get 3 with a remainder of 4.
Record the quotient 3 as the next digit in the result. 
Result so far: 103645.83
Subtracting 36 from 40 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 10:
When dividing 40 by 12, we get 3 with a remainder of 4.
Record the quotient 3 as the next digit in the result. 
Result so far: 103645.833
Deduct 36 from 40 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

In conclusion, the division gives 103645.833 with a balance of 0.0004.