Finding the Third Proportional to 309,120 and 659,066

Step by Step Solution

1. Step 1: Write the proportion equation
   309,120 : 659,066 = 659,066 : x
2. Step 2: Convert to fraction form
   309,120/659,066 = 659,066/x
3. Step 3: Cross multiply
   309,120x = 659,066 × 659,066
4. Step 4: Simplify right side
   309,120x = 434,367,992,356
5. Step 5: Solve for x
   x = 434,367,992,356/309,120
6. Step 6: Final answer
   x = 1,405,175.96