We look at the division of 392389 by 30 
We want to figure out the number of times 392389 can be divided by 30.

Advancing to step 1:
3 divided by 30 is 0 with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Take the next digit (9) from the dividend and append it to 3, then repeat: 39 / 30

Advancing to step 2:
30 can be fit into 39 1 times, resulting in a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 30 from 39 leaves us with 9.
Bring next digit (2) of the dividend behind the 9 and repeat the process: 92 / 30

Going ahead to step 3:
30 goes into 92 3 times with a remainder of 2.
The number 3 becomes the next digit in our result. 
Result so far: 13.0
Deduct 90 from 92 and we're left with 2.
Bring next digit (3) of the dividend behind the 2 and repeat the process: 23 / 30

Let's proceed to step 4:
30 can be fit into 23 0 times, resulting in a remainder of 23.
The number 0 becomes the next digit in our result. 
Result so far: 130.0
The remainder is 23 after subtracting 0 from 23.
Include the next digit (8) from the dividend after 23, then repeat: 238 / 30

Advancing to step 5:
If we divide 238 by 30, we get 7 and a remainder of 28.
The number 7 becomes the next digit in our result. 
Result so far: 1307.0
Subtracting 210 from 238 leaves us with 28.
Take the next digit (9) from the dividend and append it to 28, then repeat: 289 / 30

On to step 6:
If we divide 289 by 30, we get 9 and a remainder of 19.
The number 9 becomes the next digit in our result. 
Result so far: 13079.0
If we take 270 away from 289, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Advancing to step 7:
When dividing 190 by 30, we get 6 with a remainder of 10.
Record the quotient 6 as the next digit in the result. 
Result so far: 13079.6
Subtracting 180 from 190 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 8:
When dividing 100 by 30, we get 3 with a remainder of 10.
Use 3 as the next digit of our solution. 
Result so far: 13079.63
Deduct 90 from 100 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 9:
30 goes into 100 3 times with a remainder of 10.
Record the quotient 3 as the next digit in the result. 
Result so far: 13079.633
The remainder is 10 after subtracting 90 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final outcome is 13079.633, with a leftover of 0.001.