Step 1 :Calculate the numerator: \(1.23 \times 10^{2} + 34.5 = 1.47 \times 10^{2}\)
Step 2 :Divide the numerator by the denominator: \(\frac{1.47 \times 10^{2}}{2.3 \times 10^{-3}} = 6.39 \times 10^{4}\)
Step 3 :\(\boxed{6.39 \times 10^{4}}\)