We look at the division of 423729 by 15 
Let's see how many times 15 fits into 423729.

Going ahead to step 1:
15 goes into 4 0 times with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Take the next digit (2) from the dividend and append it to 4, then repeat: 42 / 15

Advancing to step 2:
15 goes into 42 2 times with a remainder of 12.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtract 30 from 42 to get 12.
Fetch the next digit (3) from the dividend, attach it to 12 and continue: 123 / 15

Moving on to step 3:
When dividing 123 by 15, we get 8 with a remainder of 3.
The next digit of our result is 8. 
Result so far: 28.0
Deduct 120 from 123 and we're left with 3.
Include the next digit (7) from the dividend after 3, then repeat: 37 / 15

Advancing to step 4:
15 goes into 37 2 times with a remainder of 7.
The next digit of our result is 2. 
Result so far: 282.0
Subtracting 30 from 37 leaves us with 7.
Fetch the next digit (2) from the dividend, attach it to 7 and continue: 72 / 15

Let's proceed to step 5:
When dividing 72 by 15, we get 4 with a remainder of 12.
Put 4 as the next digit of the answer. 
Result so far: 2824.0
Deduct 60 from 72 and we're left with 12.
Grab the next digit (9) from the dividend, add it to 12, then carry on: 129 / 15

Moving on to step 6:
15 goes into 129 8 times with a remainder of 9.
Write down 8 as next digit of the result. 
Result so far: 28248.0
If we take 120 away from 129, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 7:
The number 15 fits into 90 6 times, leaving a remainder of 0.
Write down 6 as next digit of the result. 
Result so far: 28248.6
The remainder is 0 after subtracting 90 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 8:
When dividing 0 by 15, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 28248.6
If we take 0 away from 0, we end up 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 9:
15 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 28248.6
Subtracting 0 from 0 leaves us 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 28248.6, with a leftover of 0.0.