Finding the Third Proportional to 218,424 and 329,641.50

Step by Step Solution

1. Step 1: Write the proportion equation
   218,424 : 329,641.50 = 329,641.50 : x
2. Step 2: Convert to fraction form
   218,424/329,641.50 = 329,641.50/x
3. Step 3: Cross multiply
   218,424x = 329,641.50 × 329,641.50
4. Step 4: Simplify right side
   218,424x = 108,663,518,522.25
5. Step 5: Solve for x
   x = 108,663,518,522.25/218,424
6. Step 6: Final answer
   x = 497,488.91