To subtract \( 4.66 \times 10^{-5} \) and \( 7.34 \times 10^{-7} \), we first need to express both numbers in terms of the same power of ten.
The first number is already in the form \( 4.66 \times 10^{-5} \).
For the second number: \[ 7.34 \times 10^{-7} = 0.0734 \times 10^{-5} \]
Now we can perform the subtraction: \[ 4.66 \times 10^{-5} - 0.0734 \times 10^{-5} = (4.66 - 0.0734) \times 10^{-5} = 4.5866 \times 10^{-5} \]
Thus, the result of the subtraction is: \[ \boxed{4.5866 \times 10^{-5}} \]