Let's divide 54307757 by 390
We're looking to find how many times 390 goes into 54307757.

Going ahead to step 1:
390 goes into 5 0 times with a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Bring next digit (4) of the dividend behind the 5 and repeat the process: 54 / 390

Let's proceed to step 2:
54 divided by 390 is 0 with a remainder of 54.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 54 after subtracting 0 from 54.
Append the next digit (3) from the dividend to 54 and continue with: 543 / 390

Step 3:
390 goes into 543 1 times with a remainder of 153.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtracting 390 from 543 leaves us with 153.
Bring next digit (0) of the dividend behind the 153 and repeat the process: 1530 / 390

Advancing to step 4:
1530 divided by 390 is 3 with a remainder of 360.
Write down 3 as next digit of the result. 
Result so far: 13.0
If we subtract 1170 from 1530, we get 360.
Bring next digit (7) of the dividend behind the 360 and repeat the process: 3607 / 390

Going ahead to step 5:
The number 390 fits into 3607 9 times, leaving a remainder of 97.
Write down 9 as next digit of the result. 
Result so far: 139.0
Deduct 3510 from 3607 and we're left with 97.
Grab the next digit (7) from the dividend, add it to 97, then carry on: 977 / 390

Going ahead to step 6:
When dividing 977 by 390, we get 2 with a remainder of 197.
Use 2 as the next digit of our solution. 
Result so far: 1392.0
Subtracting 780 from 977 leaves us with 197.
Take the next digit (5) from the dividend and append it to 197, then repeat: 1975 / 390

Step 7:
The number 390 fits into 1975 5 times, leaving a remainder of 25.
The number 5 becomes the next digit in our result. 
Result so far: 13925.0
The remainder is 25 after subtracting 1950 from 1975.
Take the next digit (7) from the dividend and append it to 25, then repeat: 257 / 390

Moving on to step 8:
390 goes into 257 0 times with a remainder of 257.
The next digit of our result is 0. 
Result so far: 139250.0
If we subtract 0 from 257, we get 257.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2570, and continue the process.

Step 9:
390 can be fit into 2570 6 times, resulting in a remainder of 230.
The next digit of our result is 6. 
Result so far: 139250.6
If we take 2340 away from 2570, we end up with 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2300, and continue the process.

On to step 10:
When dividing 2300 by 390, we get 5 with a remainder of 350.
Record the quotient 5 as the next digit in the result. 
Result so far: 139250.65
Subtracting 1950 from 2300 leaves us with 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Step 11:
390 can be fit into 3500 8 times, resulting in a remainder of 380.
Put 8 as the next digit of the answer. 
Result so far: 139250.658
Subtract 3120 from 3500 to get 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

Advancing to step 12:
390 goes into 3800 9 times with a remainder of 290.
Use 9 as the next digit of our solution. 
Result so far: 139250.6589
Deduct 3510 from 3800 and we're left with 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Going ahead to step 13:
390 can be fit into 2900 7 times, resulting in a remainder of 170.
Write down 7 as next digit of the result. 
Result so far: 139250.65897
If we take 2730 away from 2900, we end up with 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Moving on to step 14:
390 can be fit into 1700 4 times, resulting in a remainder of 140.
The next digit of our result is 4. 
Result so far: 139250.658974
Subtracting 1560 from 1700 leaves us with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Let's proceed to step 15:
When dividing 1400 by 390, we get 3 with a remainder of 230.
Record the quotient 3 as the next digit in the result. 
Result so far: 139250.6589743
If we take 1170 away from 1400, we end up with 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2300, and continue the process.

Moving on to step 16:
390 goes into 2300 5 times with a remainder of 350.
Use 5 as the next digit of our solution. 
Result so far: 139250.65897435
Deduct 1950 from 2300 and we're left with 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

In conclusion, the division gives 139250.65897435 with a balance of 3.5e-07.