1. The problem asks to write the number 321,000,000 in scientific notation. 2. Scientific notation expresses numbers as a product of a number between 1 and 10 and a power of 10. 3. To convert 321,000,000, move the decimal point 8 places to the left to get 3.21. 4. This gives the expression $$3.21 \times 10^{8}$$. 5. Therefore, the scientific notation of 321,000,000 is $$3.21 \times 10^{8}$$.