We look at the division of 728391 by 45 
Let's see how many times 45 fits into 728391.

Advancing to step 1:
When dividing 7 by 45, we get 0 with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Bring next digit (2) of the dividend behind the 7 and repeat the process: 72 / 45

Moving on to step 2:
When dividing 72 by 45, we get 1 with a remainder of 27.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 45 from 72 to get 27.
Include the next digit (8) from the dividend after 27, then repeat: 278 / 45

Moving on to step 3:
45 can be fit into 278 6 times, resulting in a remainder of 8.
Use 6 as the next digit of our solution. 
Result so far: 16.0
If we take 270 away from 278, we end up with 8.
Fetch the next digit (3) from the dividend, attach it to 8 and continue: 83 / 45

Moving on to step 4:
45 can be fit into 83 1 times, resulting in a remainder of 38.
Record the quotient 1 as the next digit in the result. 
Result so far: 161.0
Subtracting 45 from 83 leaves us with 38.
Fetch the next digit (9) from the dividend, attach it to 38 and continue: 389 / 45

Moving on to step 5:
If we divide 389 by 45, we get 8 and a remainder of 29.
The next digit of our result is 8. 
Result so far: 1618.0
Subtract 360 from 389 to get 29.
Take the next digit (1) from the dividend and append it to 29, then repeat: 291 / 45

Step 6:
When dividing 291 by 45, we get 6 with a remainder of 21.
The number 6 becomes the next digit in our result. 
Result so far: 16186.0
Subtracting 270 from 291 leaves us with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Going ahead to step 7:
210 divided by 45 is 4 with a remainder of 30.
Write down 4 as next digit of the result. 
Result so far: 16186.4
Subtracting 180 from 210 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 8:
45 goes into 300 6 times with a remainder of 30.
Put 6 as the next digit of the answer. 
Result so far: 16186.46
The remainder is 30 after subtracting 270 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 9:
300 divided by 45 is 6 with a remainder of 30.
Write down 6 as next digit of the result. 
Result so far: 16186.466
If we take 270 away from 300, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Our division results in 16186.466 with a remaining 0.003.