Finding the Third Proportional to 218,408 and 329,150

Step by Step Solution

1. Step 1: Write the proportion equation
   218,408 : 329,150 = 329,150 : x
2. Step 2: Convert to fraction form
   218,408/329,150 = 329,150/x
3. Step 3: Cross multiply
   218,408x = 329,150 × 329,150
4. Step 4: Simplify right side
   218,408x = 108,339,722,500
5. Step 5: Solve for x
   x = 108,339,722,500/218,408
6. Step 6: Final answer
   x = 496,042.83