Step 1:
The first step to converting 1407921.1578931 to a fraction is to re-write 1407921.1578931 in the form p/q where p and q are both positive integers. To start with, 1407921.1578931 can be written as simply 1407921.1578931/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 1407921.1578931, which in this case is 7. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 1407921.1578931/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 1407921.1578931/1 each by 10000000:
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 1407921.1578931 as a fraction:
1407921/1 / 1