Let's divide 12901974 by 386
We're looking to find how many times 386 goes into 12901974.

On to step 1:
386 goes into 1 0 times with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 386

Advancing to step 2:
The number 386 fits into 12 0 times, leaving a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 12 to get 12.
Take the next digit (9) from the dividend and append it to 12, then repeat: 129 / 386

Step 3:
386 goes into 129 0 times with a remainder of 129.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 129, we get 129.
Grab the next digit (0) from the dividend, add it to 129, then carry on: 1290 / 386

On to step 4:
The number 386 fits into 1290 3 times, leaving a remainder of 132.
The next digit of our result is 3. 
Result so far: 3.0
Subtracting 1158 from 1290 leaves us with 132.
Include the next digit (1) from the dividend after 132, then repeat: 1321 / 386

Step 5:
1321 divided by 386 is 3 with a remainder of 163.
Put 3 as the next digit of the answer. 
Result so far: 33.0
The remainder is 163 after subtracting 1158 from 1321.
Include the next digit (9) from the dividend after 163, then repeat: 1639 / 386

Moving on to step 6:
386 goes into 1639 4 times with a remainder of 95.
Write down 4 as next digit of the result. 
Result so far: 334.0
Subtract 1544 from 1639 to get 95.
Include the next digit (7) from the dividend after 95, then repeat: 957 / 386

Going ahead to step 7:
When dividing 957 by 386, we get 2 with a remainder of 185.
The next digit of our result is 2. 
Result so far: 3342.0
If we subtract 772 from 957, we get 185.
Fetch the next digit (4) from the dividend, attach it to 185 and continue: 1854 / 386

Let's proceed to step 8:
If we divide 1854 by 386, we get 4 and a remainder of 310.
The number 4 becomes the next digit in our result. 
Result so far: 33424.0
If we subtract 1544 from 1854, we get 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

Let's proceed to step 9:
3100 divided by 386 is 8 with a remainder of 12.
The next digit of our result is 8. 
Result so far: 33424.8
Deduct 3088 from 3100 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 10:
When dividing 120 by 386, we get 0 with a remainder of 120.
Put 0 as the next digit of the answer. 
Result so far: 33424.8
If we subtract 0 from 120, we get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Going ahead to step 11:
The number 386 fits into 1200 3 times, leaving a remainder of 42.
The next digit of our result is 3. 
Result so far: 33424.803
Deduct 1158 from 1200 and we're left with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Going ahead to step 12:
386 goes into 420 1 times with a remainder of 34.
The number 1 becomes the next digit in our result. 
Result so far: 33424.8031
Deduct 386 from 420 and we're left with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

On to step 13:
When dividing 340 by 386, we get 0 with a remainder of 340.
The next digit of our result is 0. 
Result so far: 33424.8031
If we subtract 0 from 340, we get 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Step 14:
3400 divided by 386 is 8 with a remainder of 312.
Put 8 as the next digit of the answer. 
Result so far: 33424.803108
Subtract 3088 from 3400 to get 312.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3120, and continue the process.

Step 15:
386 goes into 3120 8 times with a remainder of 32.
The next digit of our result is 8. 
Result so far: 33424.8031088
If we take 3088 away from 3120, we end up with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

In conclusion, the division gives 33424.8031088 with a balance of 3.2e-07.