Step 1:
The first step to converting 5420.578812618 to a fraction is to re-write 5420.578812618 in the form p/q where p and q are both positive integers. To start with, 5420.578812618 can be written as simply 5420.578812618/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 5420.578812618, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 5420.578812618/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 5420.578812618/1 each by 1000000000:
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 5420.578812618 as a fraction:
102991/19 / 1