3921545 ÷ 392 
Our goal is to divide 3921545 by 392.

Let's proceed to step 1:
The number 392 fits into 3 0 times, leaving a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Fetch the next digit (9) from the dividend, attach it to 3 and continue: 39 / 392

Step 2:
392 goes into 39 0 times with a remainder of 39.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 39, we get 39.
Take the next digit (2) from the dividend and append it to 39, then repeat: 392 / 392

Going ahead to step 3:
If we divide 392 by 392, we get 1 and a remainder of 0.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 392 from 392 leaves us with 0.
Bring next digit (1) of the dividend behind the 0 and repeat the process: 1 / 392

Moving on to step 4:
If we divide 1 by 392, we get 0 and a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
Subtracting 0 from 1 leaves us with 1.
Include the next digit (5) from the dividend after 1, then repeat: 15 / 392

Step 5:
The number 392 fits into 15 0 times, leaving a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 100.0
Subtracting 0 from 15 leaves us with 15.
Include the next digit (4) from the dividend after 15, then repeat: 154 / 392

On to step 6:
When dividing 154 by 392, we get 0 with a remainder of 154.
Write down 0 as next digit of the result. 
Result so far: 1000.0
Deduct 0 from 154 and we're left with 154.
Append the next digit (5) from the dividend to 154 and continue with: 1545 / 392

Let's proceed to step 7:
If we divide 1545 by 392, we get 3 and a remainder of 369.
Write down 3 as next digit of the result. 
Result so far: 10003.0
The remainder is 369 after subtracting 1176 from 1545.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3690, and continue the process.

Moving on to step 8:
If we divide 3690 by 392, we get 9 and a remainder of 162.
The next digit of our result is 9. 
Result so far: 10003.9
The remainder is 162 after subtracting 3528 from 3690.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1620, and continue the process.

On to step 9:
1620 divided by 392 is 4 with a remainder of 52.
Record the quotient 4 as the next digit in the result. 
Result so far: 10003.94
If we subtract 1568 from 1620, we get 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Let's proceed to step 10:
The number 392 fits into 520 1 times, leaving a remainder of 128.
Record the quotient 1 as the next digit in the result. 
Result so far: 10003.941
If we take 392 away from 520, we end up with 128.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

Moving on to step 11:
When dividing 1280 by 392, we get 3 with a remainder of 104.
Use 3 as the next digit of our solution. 
Result so far: 10003.9413
If we take 1176 away from 1280, we end up with 104.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

Let's proceed to step 12:
392 goes into 1040 2 times with a remainder of 256.
Write down 2 as next digit of the result. 
Result so far: 10003.94132
If we subtract 784 from 1040, we get 256.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

Step 13:
The number 392 fits into 2560 6 times, leaving a remainder of 208.
Write down 6 as next digit of the result. 
Result so far: 10003.941326
If we take 2352 away from 2560, we end up with 208.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

Moving on to step 14:
If we divide 2080 by 392, we get 5 and a remainder of 120.
Put 5 as the next digit of the answer. 
Result so far: 10003.9413265
The remainder is 120 after subtracting 1960 from 2080.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

On to step 15:
When dividing 1200 by 392, we get 3 with a remainder of 24.
The next digit of our result is 3. 
Result so far: 10003.94132653
Subtract 1176 from 1200 to get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

The final result is 10003.94132653 with a remainder of 2.4e-08.