639507 ÷ 54 
Our goal is to divide 639507 by 54.

Step 1:
If we divide 6 by 54, we get 0 and a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Take the next digit (3) from the dividend and append it to 6, then repeat: 63 / 54

On to step 2:
54 goes into 63 1 times with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 54 from 63 and we're left with 9.
Grab the next digit (9) from the dividend, add it to 9, then carry on: 99 / 54

Let's proceed to step 3:
When dividing 99 by 54, we get 1 with a remainder of 45.
The number 1 becomes the next digit in our result. 
Result so far: 11.0
If we subtract 54 from 99, we get 45.
Include the next digit (5) from the dividend after 45, then repeat: 455 / 54

Step 4:
If we divide 455 by 54, we get 8 and a remainder of 23.
Write down 8 as next digit of the result. 
Result so far: 118.0
Deduct 432 from 455 and we're left with 23.
Grab the next digit (0) from the dividend, add it to 23, then carry on: 230 / 54

Step 5:
The number 54 fits into 230 4 times, leaving a remainder of 14.
Put 4 as the next digit of the answer. 
Result so far: 1184.0
Subtracting 216 from 230 leaves us with 14.
Append the next digit (7) from the dividend to 14 and continue with: 147 / 54

Going ahead to step 6:
54 can be fit into 147 2 times, resulting in a remainder of 39.
The next digit of our result is 2. 
Result so far: 11842.0
Subtracting 108 from 147 leaves us with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Advancing to step 7:
If we divide 390 by 54, we get 7 and a remainder of 12.
The next digit of our result is 7. 
Result so far: 11842.7
Subtracting 378 from 390 leaves us 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.

Moving on to step 8:
120 divided by 54 is 2 with a remainder of 12.
The next digit of our result is 2. 
Result so far: 11842.72
The remainder is 12 after subtracting 108 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 9:
When dividing 120 by 54, we get 2 with a remainder of 12.
Record the quotient 2 as the next digit in the result. 
Result so far: 11842.722
Subtracting 108 from 120 leaves us 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.

The final outcome is 11842.722, with a leftover of 0.0012.