We look at the division of 640478 by 12 
We're looking to find how many times 12 goes into 640478.

Step 1:
The number 12 fits into 6 0 times, leaving a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 12

Let's proceed to step 2:
If we divide 64 by 12, we get 5 and a remainder of 4.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
Subtracting 60 from 64 leaves us with 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 12

Let's proceed to step 3:
12 can be fit into 40 3 times, resulting in a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 53.0
Deduct 36 from 40 and we're left with 4.
Grab the next digit (4) from the dividend, add it to 4, then carry on: 44 / 12

Let's proceed to step 4:
12 goes into 44 3 times with a remainder of 8.
Put 3 as the next digit of the answer. 
Result so far: 533.0
If we subtract 36 from 44, we get 8.
Bring next digit (7) of the dividend behind the 8 and repeat the process: 87 / 12

Let's proceed to step 5:
12 can be fit into 87 7 times, resulting in a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 5337.0
If we subtract 84 from 87, we get 3.
Bring next digit (8) of the dividend behind the 3 and repeat the process: 38 / 12

Moving on to step 6:
12 can be fit into 38 3 times, resulting in a remainder of 2.
Put 3 as the next digit of the answer. 
Result so far: 53373.0
Subtract 36 from 38 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 7:
If we divide 20 by 12, we get 1 and a remainder of 8.
The next digit of our result is 1. 
Result so far: 53373.1
Subtracting 12 from 20 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 8:
When dividing 80 by 12, we get 6 with a remainder of 8.
Write down 6 as next digit of the result. 
Result so far: 53373.16
If we subtract 72 from 80, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 9:
12 goes into 80 6 times with a remainder of 8.
Put 6 as the next digit of the answer. 
Result so far: 53373.166
Subtracting 72 from 80 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

In conclusion, the division gives 53373.166 with a balance of 0.0008.