1. The problem states that the radius of planet Jupiter is given as $7.149 \times 10^{4}$ km. 2. This is a scientific notation representation of the radius. 3. To understand the value in standard decimal form, multiply $7.149$ by $10^{4}$. 4. Calculate: $$7.149 \times 10^{4} = 7.149 \times 10000 = 71490$$ 5. Therefore, the radius of Jupiter is 71490 km. Final answer: The radius of Jupiter is $71490$ km.