To calculate the expression \(7 \times 10^4 + 8.6 \times 10^5\), we first evaluate each term separately.
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Calculate \(7 \times 10^4\): \[ 7 \times 10^4 = 7 \times 10000 = 70000 \]
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Calculate \(8.6 \times 10^5\): \[ 8.6 \times 10^5 = 8.6 \times 100000 = 860000 \]
Now, we can add the two results together: \[ 70000 + 860000 = 930000 \]
Therefore, the final result is: \[ \boxed{930000} \]