Step 1:
The first step to converting 12429687.400188 to a fraction is to re-write 12429687.400188 in the form p/q where p and q are both positive integers. To start with, 12429687.400188 can be written as simply 12429687.400188/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 12429687.400188, which in this case is 6. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 12429687.400188/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 12429687.400188/1 each by 1000000:
Step 3:
Now the last step is to simplify the fraction (if possible) by finding similar factors and cancelling them out, which leads to the following answer for 12429687.400188 as a fraction:
12429687/1 / 1