1. **State the problem:** Calculate the difference between $9.02 \times 10^5$ and $5.23 \times 10^5$. 2. **Formula and rules:** When subtracting numbers in scientific notation with the same power of 10, subtract the coefficients and keep the power of 10 the same. 3. **Intermediate work:** $$9.02 \times 10^5 - 5.23 \times 10^5 = (9.02 - 5.23) \times 10^5$$ 4. **Simplify the subtraction:** $$9.02 - 5.23 = 3.79$$ 5. **Final answer:** $$3.79 \times 10^5$$ This means the result is $379000$ in standard notation.