We look at the division of 42636420 by 123 
We want to divide 42636420 by 123.

On to step 1:
123 goes into 4 0 times with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Include the next digit (2) from the dividend after 4, then repeat: 42 / 123

Moving on to step 2:
123 goes into 42 0 times with a remainder of 42.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 42, we get 42.
Grab the next digit (6) from the dividend, add it to 42, then carry on: 426 / 123

Step 3:
The number 123 fits into 426 3 times, leaving 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 369 from 426.
Fetch the next digit (3) from the dividend, attach it to 57 and continue: 573 / 123

Step 4:
If we divide 573 by 123, we get 4 and a remainder of 81.
Record the quotient 4 as the next digit in the result. 
Result so far: 34.0
Subtracting 492 from 573 leaves us with 81.
Take the next digit (6) from the dividend and append it to 81, then repeat: 816 / 123

Let's proceed to step 5:
123 goes into 816 6 times with a remainder of 78.
Use 6 as the next digit of our solution. 
Result so far: 346.0
Subtract 738 from 816 to get 78.
Fetch the next digit (4) from the dividend, attach it to 78 and continue: 784 / 123

Step 6:
784 divided by 123 is 6 with a remainder of 46.
Record the quotient 6 as the next digit in the result. 
Result so far: 3466.0
Subtract 738 from 784 to get 46.
Include the next digit (2) from the dividend after 46, then repeat: 462 / 123

Going ahead to step 7:
The number 123 fits into 462 3 times, leaving a remainder of 93.
Put 3 as the next digit of the answer. 
Result so far: 34663.0
Subtract 369 from 462 to get 93.
Grab the next digit (0) from the dividend, add it to 93, then carry on: 930 / 123

Let's proceed to step 8:
The number 123 fits into 930 7 times, leaving a remainder of 69.
Record the quotient 7 as the next digit in the result. 
Result so far: 346637.0
If we subtract 861 from 930, we get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Advancing to step 9:
The number 123 fits into 690 5 times, leaving a remainder of 75.
Record the quotient 5 as the next digit in the result. 
Result so far: 346637.5
If we take 615 away from 690, we end up with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

On to step 10:
When dividing 750 by 123, we get 6 with a remainder of 12.
The number 6 becomes the next digit in our result. 
Result so far: 346637.56
If we take 738 away from 750, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 11:
123 can be fit into 120 0 times, resulting in a remainder of 120.
The next digit of our result is 0. 
Result so far: 346637.56
The remainder is 120 after subtracting 0 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

On to step 12:
123 goes into 1200 9 times with a remainder of 93.
The number 9 becomes the next digit in our result. 
Result so far: 346637.5609
Subtracting 1107 from 1200 leaves us with 93.
Since there are no more digits in the dividend, we add a zero to the remainder making it 930, and continue the process.

Moving on to step 13:
123 goes into 930 7 times with a remainder of 69.
Use 7 as the next digit of our solution. 
Result so far: 346637.56097
Subtracting 861 from 930 leaves us with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Going ahead to step 14:
When dividing 690 by 123, we get 5 with a remainder of 75.
Put 5 as the next digit of the answer. 
Result so far: 346637.560975
If we subtract 615 from 690, we get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

On to step 15:
750 divided by 123 is 6 with a remainder of 12.
The next digit of our result is 6. 
Result so far: 346637.5609756
Subtract 738 from 750 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 16:
The number 123 fits into 120 0 times, leaving a remainder of 120.
Put 0 as the next digit of the answer. 
Result so far: 346637.5609756
Subtract 0 from 120 to get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

In conclusion, the division gives 346637.5609756 with a balance of 1.2e-07.