We look at the division of 186393 by 45 
We want to figure out the number of times 186393 can be divided by 45.

Going ahead to step 1:
1 divided by 45 is 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Append the next digit (8) from the dividend to 1 and continue with: 18 / 45

Advancing to step 2:
If we divide 18 by 45, we get 0 and a remainder of 18.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 18, we end up with 18.
Take the next digit (6) from the dividend and append it to 18, then repeat: 186 / 45

On to step 3:
45 can be fit into 186 4 times, resulting in a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Deduct 180 from 186 and we're left with 6.
Take the next digit (3) from the dividend and append it to 6, then repeat: 63 / 45

Advancing to step 4:
The number 45 fits into 63 1 times, leaving a remainder of 18.
Use 1 as the next digit of our solution. 
Result so far: 41.0
Deduct 45 from 63 and we're left with 18.
Take the next digit (9) from the dividend and append it to 18, then repeat: 189 / 45

Advancing to step 5:
If we divide 189 by 45, we get 4 and a remainder of 9.
The next digit of our result is 4. 
Result so far: 414.0
Subtract 180 from 189 to get 9.
Fetch the next digit (3) from the dividend, attach it to 9 and continue: 93 / 45

Going ahead to step 6:
When dividing 93 by 45, we get 2 with a remainder of 3.
Use 2 as the next digit of our solution. 
Result so far: 4142.0
If we take 90 away from 93, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 7:
45 goes into 30 0 times with a remainder of 30.
Record the quotient 0 as the next digit in the result. 
Result so far: 4142.0
The remainder is 30 after subtracting 0 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 8:
300 divided by 45 is 6 with a remainder of 30.
Put 6 as the next digit of the answer. 
Result so far: 4142.06
Deduct 270 from 300 and we're left 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.

Let's proceed to step 9:
300 divided by 45 is 6 with a remainder of 30.
The next digit of our result is 6. 
Result so far: 4142.066
Subtracting 270 from 300 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.

The final outcome is 4142.066, with a leftover of 0.003.