We divide 638412 by 15
We're looking to find how many times 15 goes into 638412.

Going ahead to step 1:
15 can be fit into 6 0 times, resulting in a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 15

Advancing to step 2:
15 goes into 63 4 times with a remainder of 3.
The next digit of our result is 4. 
Result so far: 4.0
Deduct 60 from 63 and we're left with 3.
Bring next digit (8) of the dividend behind the 3 and repeat the process: 38 / 15

Step 3:
If we divide 38 by 15, we get 2 and a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 42.0
Subtract 30 from 38 to get 8.
Include the next digit (4) from the dividend after 8, then repeat: 84 / 15

Moving on to step 4:
If we divide 84 by 15, we get 5 and a remainder of 9.
The number 5 becomes the next digit in our result. 
Result so far: 425.0
The remainder is 9 after subtracting 75 from 84.
Append the next digit (1) from the dividend to 9 and continue with: 91 / 15

Moving on to step 5:
When dividing 91 by 15, we get 6 with a remainder of 1.
The number 6 becomes the next digit in our result. 
Result so far: 4256.0
Deduct 90 from 91 and we're left with 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 15

Let's proceed to step 6:
12 divided by 15 is 0 with a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 42560.0
If we subtract 0 from 12, we 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.

Step 7:
The number 15 fits into 120 8 times, leaving a remainder of 0.
Write down 8 as next digit of the result. 
Result so far: 42560.8
Deduct 120 from 120 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 8:
0 divided by 15 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 42560.8
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 9:
The number 15 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 42560.8
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 42560.8, with a leftover of 0.0.