We look at the division of 66486093 by 578 
Let's see how many times 578 fits into 66486093.

Step 1:
The number 578 fits into 6 0 times, leaving a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 578

Moving on to step 2:
The number 578 fits into 66 0 times, leaving a remainder of 66.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 66 and we're left with 66.
Include the next digit (4) from the dividend after 66, then repeat: 664 / 578

On to step 3:
If we divide 664 by 578, we get 1 and a remainder of 86.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 578 from 664 and we're left with 86.
Fetch the next digit (8) from the dividend, attach it to 86 and continue: 868 / 578

Let's proceed to step 4:
If we divide 868 by 578, we get 1 and a remainder of 290.
Record the quotient 1 as the next digit in the result. 
Result so far: 11.0
Subtract 578 from 868 to get 290.
Fetch the next digit (6) from the dividend, attach it to 290 and continue: 2906 / 578

Advancing to step 5:
578 goes into 2906 5 times with a remainder of 16.
Record the quotient 5 as the next digit in the result. 
Result so far: 115.0
If we take 2890 away from 2906, we end up with 16.
Include the next digit (0) from the dividend after 16, then repeat: 160 / 578

On to step 6:
578 can be fit into 160 0 times, resulting in a remainder of 160.
Write down 0 as next digit of the result. 
Result so far: 1150.0
If we subtract 0 from 160, we get 160.
Fetch the next digit (9) from the dividend, attach it to 160 and continue: 1609 / 578

Moving on to step 7:
578 can be fit into 1609 2 times, resulting in a remainder of 453.
Write down 2 as next digit of the result. 
Result so far: 11502.0
Subtracting 1156 from 1609 leaves us with 453.
Take the next digit (3) from the dividend and append it to 453, then repeat: 4533 / 578

On to step 8:
578 goes into 4533 7 times with a remainder of 487.
Write down 7 as next digit of the result. 
Result so far: 115027.0
If we subtract 4046 from 4533, we get 487.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4870, and continue the process.

Let's proceed to step 9:
The number 578 fits into 4870 8 times, leaving a remainder of 246.
Record the quotient 8 as the next digit in the result. 
Result so far: 115027.8
If we subtract 4624 from 4870, we get 246.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2460, and continue the process.

Let's proceed to step 10:
When dividing 2460 by 578, we get 4 with a remainder of 148.
Put 4 as the next digit of the answer. 
Result so far: 115027.84
The remainder is 148 after subtracting 2312 from 2460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

On to step 11:
578 goes into 1480 2 times with a remainder of 324.
The number 2 becomes the next digit in our result. 
Result so far: 115027.842
Deduct 1156 from 1480 and we're left with 324.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3240, and continue the process.

Step 12:
The number 578 fits into 3240 5 times, leaving a remainder of 350.
Write down 5 as next digit of the result. 
Result so far: 115027.8425
If we subtract 2890 from 3240, we get 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Going ahead to step 13:
If we divide 3500 by 578, we get 6 and a remainder of 32.
Use 6 as the next digit of our solution. 
Result so far: 115027.84256
Subtract 3468 from 3500 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

On to step 14:
578 can be fit into 320 0 times, resulting in a remainder of 320.
Put 0 as the next digit of the answer. 
Result so far: 115027.84256
Subtracting 0 from 320 leaves us with 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

On to step 15:
If we divide 3200 by 578, we get 5 and a remainder of 310.
The next digit of our result is 5. 
Result so far: 115027.8425605
If we take 2890 away from 3200, we end up with 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

On to step 16:
When dividing 3100 by 578, we get 5 with a remainder of 210.
The next digit of our result is 5. 
Result so far: 115027.84256055
Subtract 2890 from 3100 to get 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

After the division, we end up with 115027.84256055 and a remainder of 2.1e-07.