Step 1:
The first step to converting 7405.438630125 to a fraction is to re-write 7405.438630125 in the form p/q where p and q are both positive integers. To start with, 7405.438630125 can be written as simply 7405.438630125/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 7405.438630125, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 7405.438630125/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 7405.438630125/1 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 7405.438630125 as a fraction:
66649/9 / 1