To multiply the numbers in scientific notation \( (3.2 \times 10^8) \) and \( (2.9 \times 10^{10}) \), follow these steps:
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Multiply the coefficients: \[ 3.2 \times 2.9 = 9.28 \]
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Add the exponents of the powers of 10: \[ 10^8 \times 10^{10} = 10^{(8+10)} = 10^{18} \]
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Combine the results: \[ 9.28 \times 10^{18} \]
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Convert to scientific notation: Since \(9.28\) is already in the range between \(1\) and \(10\), no further adjustment is needed.
Thus, the final answer in scientific notation is: \[ \boxed{9.28 \times 10^{18}} \]