We divide 12388 by 30
We're looking to find how many times 30 goes into 12388.

Let's proceed to step 1:
If we divide 1 by 30, we get 0 and a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 30

Advancing to step 2:
12 divided by 30 is 0 with a remainder of 12.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 12 to get 12.
Append the next digit (3) from the dividend to 12 and continue with: 123 / 30

On to step 3:
The number 30 fits into 123 4 times, leaving a remainder of 3.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtracting 120 from 123 leaves us with 3.
Take the next digit (8) from the dividend and append it to 3, then repeat: 38 / 30

Advancing to step 4:
30 goes into 38 1 times with a remainder of 8.
The next digit of our result is 1. 
Result so far: 41.0
Subtracting 30 from 38 leaves us with 8.
Take the next digit (8) from the dividend and append it to 8, then repeat: 88 / 30

Let's proceed to step 5:
30 goes into 88 2 times with a remainder of 28.
The number 2 becomes the next digit in our result. 
Result so far: 412.0
Deduct 60 from 88 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Let's proceed to step 6:
30 can be fit into 280 9 times, resulting in a remainder of 10.
Write down 9 as next digit of the result. 
Result so far: 412.9
Subtracting 270 from 280 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 7:
The number 30 fits into 100 3 times, leaving a remainder of 10.
The next digit of our result is 3. 
Result so far: 412.93
Subtract 90 from 100 to 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:
30 goes into 100 3 times with a remainder of 10.
Record the quotient 3 as the next digit in the result. 
Result so far: 412.933
Subtract 90 from 100 to 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.

The final result is 412.933 with a remainder of 0.001.