Finding the Third Proportional to 217,980 and 332,620.50

Step by Step Solution

1. Step 1: Write the proportion equation
   217,980 : 332,620.50 = 332,620.50 : x
2. Step 2: Convert to fraction form
   217,980/332,620.50 = 332,620.50/x
3. Step 3: Cross multiply
   217,980x = 332,620.50 × 332,620.50
4. Step 4: Simplify right side
   217,980x = 110,636,397,020.25
5. Step 5: Solve for x
   x = 110,636,397,020.25/217,980
6. Step 6: Final answer
   x = 507,552.97