399278 ÷ 18 
We want to figure out the number of times 399278 can be divided by 18.

Moving on to step 1:
18 can be fit into 3 0 times, resulting in a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 18

Moving on to step 2:
If we divide 39 by 18, we get 2 and a remainder of 3.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtracting 36 from 39 leaves us with 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 18

Going ahead to step 3:
If we divide 39 by 18, we get 2 and a remainder of 3.
Put 2 as the next digit of the answer. 
Result so far: 22.0
Subtracting 36 from 39 leaves us with 3.
Bring next digit (2) of the dividend behind the 3 and repeat the process: 32 / 18

Let's proceed to step 4:
When dividing 32 by 18, we get 1 with a remainder of 14.
Write down 1 as next digit of the result. 
Result so far: 221.0
Subtracting 18 from 32 leaves us with 14.
Bring next digit (7) of the dividend behind the 14 and repeat the process: 147 / 18

On to step 5:
When dividing 147 by 18, we get 8 with a remainder of 3.
The number 8 becomes the next digit in our result. 
Result so far: 2218.0
The remainder is 3 after subtracting 144 from 147.
Append the next digit (8) from the dividend to 3 and continue with: 38 / 18

On to step 6:
38 divided by 18 is 2 with a remainder of 2.
Use 2 as the next digit of our solution. 
Result so far: 22182.0
Deduct 36 from 38 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 7:
18 goes into 20 1 times with a remainder of 2.
Use 1 as the next digit of our solution. 
Result so far: 22182.1
Subtract 18 from 20 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 8:
If we divide 20 by 18, we get 1 and a remainder of 2.
The next digit of our result is 1. 
Result so far: 22182.11
The remainder is 2 after subtracting 18 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final outcome is 22182.11, with a leftover of 0.002.