We're dividing 639851 by 45 
Let's see how many times 45 fits into 639851.

Let's proceed to step 1:
45 can be fit into 6 0 times, resulting in a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 45

On to step 2:
If we divide 63 by 45, we get 1 and a remainder of 18.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 18 after subtracting 45 from 63.
Bring next digit (9) of the dividend behind the 18 and repeat the process: 189 / 45

Let's proceed to step 3:
The number 45 fits into 189 4 times, leaving a remainder of 9.
Use 4 as the next digit of our solution. 
Result so far: 14.0
If we subtract 180 from 189, we get 9.
Grab the next digit (8) from the dividend, add it to 9, then carry on: 98 / 45

Step 4:
45 goes into 98 2 times with a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 142.0
If we take 90 away from 98, we end up with 8.
Take the next digit (5) from the dividend and append it to 8, then repeat: 85 / 45

Step 5:
The number 45 fits into 85 1 times, leaving a remainder of 40.
Put 1 as the next digit of the answer. 
Result so far: 1421.0
Deduct 45 from 85 and we're left with 40.
Fetch the next digit (1) from the dividend, attach it to 40 and continue: 401 / 45

Step 6:
The number 45 fits into 401 8 times, leaving a remainder of 41.
Use 8 as the next digit of our solution. 
Result so far: 14218.0
If we take 360 away from 401, we end up with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Let's proceed to step 7:
The number 45 fits into 410 9 times, leaving a remainder of 5.
The number 9 becomes the next digit in our result. 
Result so far: 14218.9
Subtracting 405 from 410 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 8:
When dividing 50 by 45, we get 1 with a remainder of 5.
The number 1 becomes the next digit in our result. 
Result so far: 14218.91
If we take 45 away from 50, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 9:
45 can be fit into 50 1 times, resulting in a remainder of 5.
Put 1 as the next digit of the answer. 
Result so far: 14218.911
Deduct 45 from 50 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The final outcome is 14218.911, with a leftover of 0.0005.