To solve the equation \( 10 \log x = 10^{18} \), we can first simplify it:
\[ \log x = 10^{17} \]
Next, we convert from logarithmic form to exponential form. The equation \( \log x = 10^{17} \) implies:
\[ x = 10^{10^{17}} \]
Therefore, the value of \( x \) is \( 10^{10^{17}} \).
However, none of the provided responses directly correspond to \( 10^{10^{17}} \). It seems there was a misunderstanding or miscommunication regarding the problem.
If looking for a typical value, if you were to express the answer with the values you've given, you should look for the exponential notation \( 10^{18} \), which doesn't apply here.
Yet considering the response options you listed, the closest contextual correlation would be \( 10^{18} \) (but this was not the computation derived from the equation).
If you clarify, we can resolve from different contexts as needed!