Step 1:
The first step to converting 390558.42318893 to a fraction is to re-write 390558.42318893 in the form p/q where p and q are both positive integers. To start with, 390558.42318893 can be written as simply 390558.42318893/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 390558.42318893, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 390558.42318893/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 390558.42318893/1 each by 100000000:
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 390558.42318893 as a fraction:
781117/2 / 1