We're dividing 548309 by 90 
We want to figure out the number of times 548309 can be divided by 90.

On to step 1:
When dividing 5 by 90, we get 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Take the next digit (4) from the dividend and append it to 5, then repeat: 54 / 90

On to step 2:
The number 90 fits into 54 0 times, leaving a remainder of 54.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 54 leaves us with 54.
Append the next digit (8) from the dividend to 54 and continue with: 548 / 90

Step 3:
If we divide 548 by 90, we get 6 and a remainder of 8.
Write down 6 as next digit of the result. 
Result so far: 6.0
If we subtract 540 from 548, we get 8.
Include the next digit (3) from the dividend after 8, then repeat: 83 / 90

Step 4:
90 goes into 83 0 times with a remainder of 83.
The number 0 becomes the next digit in our result. 
Result so far: 60.0
If we subtract 0 from 83, we get 83.
Append the next digit (0) from the dividend to 83 and continue with: 830 / 90

Let's proceed to step 5:
90 goes into 830 9 times with a remainder of 20.
The next digit of our result is 9. 
Result so far: 609.0
Subtracting 810 from 830 leaves us with 20.
Take the next digit (9) from the dividend and append it to 20, then repeat: 209 / 90

Going ahead to step 6:
If we divide 209 by 90, we get 2 and a remainder of 29.
Put 2 as the next digit of the answer. 
Result so far: 6092.0
If we take 180 away from 209, we end up with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Step 7:
290 divided by 90 is 3 with a remainder of 20.
Write down 3 as next digit of the result. 
Result so far: 6092.3
The remainder is 20 after subtracting 270 from 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 8:
When dividing 200 by 90, we get 2 with a remainder of 20.
The next digit of our result is 2. 
Result so far: 6092.32
Subtract 180 from 200 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 9:
If we divide 200 by 90, we get 2 and a remainder of 20.
Record the quotient 2 as the next digit in the result. 
Result so far: 6092.322
The remainder is 20 after subtracting 180 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The final outcome is 6092.322, with a leftover of 0.002.