Step 1:
The first step to converting 390493.78550864 to a fraction is to re-write 390493.78550864 in the form p/q where p and q are both positive integers. To start with, 390493.78550864 can be written as simply 390493.78550864/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 390493.78550864, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 390493.78550864/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 390493.78550864/1 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 390493.78550864 as a fraction:
390494/1 / 1