Step 1:
The first step to converting 409486923.8138 to a fraction is to re-write 409486923.8138 in the form p/q where p and q are both positive integers. To start with, 409486923.8138 can be written as simply 409486923.8138/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 409486923.8138, which in this case is 4. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 409486923.8138/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 409486923.8138/1 each by 10000:
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 409486923.8138 as a fraction:
409486923/1 / 1