Step 1:
The first step to converting 260420.5978376 to a fraction is to re-write 260420.5978376 in the form p/q where p and q are both positive integers. To start with, 260420.5978376 can be written as simply 260420.5978376/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 260420.5978376, which in this case is 7. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 260420.5978376/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 260420.5978376/1 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 260420.5978376 as a fraction:
520841/2 / 1