Finding the Third Proportional to 404.72 and 529.17

Step by Step Solution

1. Step 1: Write the proportion equation
   404.72 : 529.17 = 529.17 : x
2. Step 2: Convert to fraction form
   404.72/529.17 = 529.17/x
3. Step 3: Cross multiply
   404.72x = 529.17 × 529.17
4. Step 4: Simplify right side
   404.72x = 280,022.87
5. Step 5: Solve for x
   x = 280,022.87/404.72
6. Step 6: Final answer
   x = 691.89