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To add the numbers \( 7.3 \times 10^7 \) and \( 1.8 \times 10^7 \), you can first combine their coefficients, since they have the same exponent.
\[
7.3 + 1.8 = 9.1
\]
Now, keeping the common exponent of \( 10^7 \), you get:
\[
9.1 \times 10^7
\]
So, the sum of \( 7.3 \times 10^7 + 1.8 \times 10^7 \) is:
\[
9.1 \times 10^7
\]