Let's divide 578780 by 90
Let's see how many times 90 fits into 578780.

Going ahead to step 1:
If we divide 5 by 90, we get 0 and a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Include the next digit (7) from the dividend after 5, then repeat: 57 / 90

Moving on to step 2:
90 can be fit into 57 0 times, resulting in a remainder of 57.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 57, we get 57.
Fetch the next digit (8) from the dividend, attach it to 57 and continue: 578 / 90

Going ahead to step 3:
578 divided by 90 is 6 with a remainder of 38.
Use 6 as the next digit of our solution. 
Result so far: 6.0
The remainder is 38 after subtracting 540 from 578.
Fetch the next digit (7) from the dividend, attach it to 38 and continue: 387 / 90

Going ahead to step 4:
387 divided by 90 is 4 with a remainder of 27.
Record the quotient 4 as the next digit in the result. 
Result so far: 64.0
Deduct 360 from 387 and we're left with 27.
Include the next digit (8) from the dividend after 27, then repeat: 278 / 90

Let's proceed to step 5:
When dividing 278 by 90, we get 3 with a remainder of 8.
Record the quotient 3 as the next digit in the result. 
Result so far: 643.0
If we subtract 270 from 278, we get 8.
Take the next digit (0) from the dividend and append it to 8, then repeat: 80 / 90

Let's proceed to step 6:
90 can be fit into 80 0 times, resulting in a remainder of 80.
Use 0 as the next digit of our solution. 
Result so far: 6430.0
The remainder is 80 after subtracting 0 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Let's proceed to step 7:
90 can be fit into 800 8 times, resulting in a remainder of 80.
Use 8 as the next digit of our solution. 
Result so far: 6430.8
If we take 720 away from 800, we end up with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Advancing to step 8:
When dividing 800 by 90, we get 8 with a remainder of 80.
The next digit of our result is 8. 
Result so far: 6430.88
Subtracting 720 from 800 leaves us with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

The final result is 6430.88 with a remainder of 0.08.