We're dividing 12135426 by 387 
We're looking to find how many times 387 goes into 12135426.

On to step 1:
387 can be fit into 1 0 times, resulting in a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 387

Moving on to step 2:
When dividing 12 by 387, we get 0 with a remainder of 12.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 12, we end up with 12.
Take the next digit (1) from the dividend and append it to 12, then repeat: 121 / 387

On to step 3:
387 can be fit into 121 0 times, resulting in a remainder of 121.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 121, we get 121.
Fetch the next digit (3) from the dividend, attach it to 121 and continue: 1213 / 387

Step 4:
When dividing 1213 by 387, we get 3 with a remainder of 52.
The next digit of our result is 3. 
Result so far: 3.0
Deduct 1161 from 1213 and we're left with 52.
Grab the next digit (5) from the dividend, add it to 52, then carry on: 525 / 387

Going ahead to step 5:
When dividing 525 by 387, we get 1 with a remainder of 138.
Use 1 as the next digit of our solution. 
Result so far: 31.0
Deduct 387 from 525 and we're left with 138.
Take the next digit (4) from the dividend and append it to 138, then repeat: 1384 / 387

On to step 6:
If we divide 1384 by 387, we get 3 and a remainder of 223.
Record the quotient 3 as the next digit in the result. 
Result so far: 313.0
Subtract 1161 from 1384 to get 223.
Take the next digit (2) from the dividend and append it to 223, then repeat: 2232 / 387

Advancing to step 7:
387 can be fit into 2232 5 times, resulting in a remainder of 297.
Use 5 as the next digit of our solution. 
Result so far: 3135.0
Subtracting 1935 from 2232 leaves us with 297.
Grab the next digit (6) from the dividend, add it to 297, then carry on: 2976 / 387

Moving on to step 8:
The number 387 fits into 2976 7 times, leaving a remainder of 267.
Record the quotient 7 as the next digit in the result. 
Result so far: 31357.0
Deduct 2709 from 2976 and we're left with 267.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2670, and continue the process.

Let's proceed to step 9:
2670 divided by 387 is 6 with a remainder of 348.
Record the quotient 6 as the next digit in the result. 
Result so far: 31357.6
The remainder is 348 after subtracting 2322 from 2670.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3480, and continue the process.

Step 10:
When dividing 3480 by 387, we get 8 with a remainder of 384.
Write down 8 as next digit of the result. 
Result so far: 31357.68
If we subtract 3096 from 3480, we get 384.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3840, and continue the process.

Step 11:
387 can be fit into 3840 9 times, resulting in a remainder of 357.
Put 9 as the next digit of the answer. 
Result so far: 31357.689
If we take 3483 away from 3840, we end up with 357.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3570, and continue the process.

Step 12:
If we divide 3570 by 387, we get 9 and a remainder of 87.
The number 9 becomes the next digit in our result. 
Result so far: 31357.6899
Subtract 3483 from 3570 to get 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Our division results in 31357.6899 with a remaining 0.00087.