306863 ÷ 15 
Our goal is to divide 306863 by 15.

Going ahead to step 1:
When dividing 3 by 15, we get 0 with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Take the next digit (0) from the dividend and append it to 3, then repeat: 30 / 15

Moving on to step 2:
The number 15 fits into 30 2 times, leaving a remainder of 0.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Deduct 30 from 30 and we're left with 0.
Take the next digit (6) from the dividend and append it to 0, then repeat: 6 / 15

Moving on to step 3:
15 can be fit into 6 0 times, resulting in a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 20.0
Subtracting 0 from 6 leaves us with 6.
Fetch the next digit (8) from the dividend, attach it to 6 and continue: 68 / 15

Going ahead to step 4:
The number 15 fits into 68 4 times, leaving a remainder of 8.
The number 4 becomes the next digit in our result. 
Result so far: 204.0
If we take 60 away from 68, we end up with 8.
Include the next digit (6) from the dividend after 8, then repeat: 86 / 15

Going ahead to step 5:
The number 15 fits into 86 5 times, leaving a remainder of 11.
The next digit of our result is 5. 
Result so far: 2045.0
Subtract 75 from 86 to get 11.
Include the next digit (3) from the dividend after 11, then repeat: 113 / 15

Let's proceed to step 6:
When dividing 113 by 15, we get 7 with a remainder of 8.
Record the quotient 7 as the next digit in the result. 
Result so far: 20457.0
The remainder is 8 after subtracting 105 from 113.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 7:
80 divided by 15 is 5 with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 20457.5
Subtracting 75 from 80 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:
If we divide 50 by 15, we get 3 and a remainder of 5.
The number 3 becomes the next digit in our result. 
Result so far: 20457.53
If we subtract 45 from 50, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 9:
If we divide 50 by 15, we get 3 and a remainder of 5.
Write down 3 as next digit of the result. 
Result so far: 20457.533
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 20457.533, with a leftover of 0.0005.