Finding the Third Proportional to 218,948 and 329,988.50

Step by Step Solution

1. Step 1: Write the proportion equation
   218,948 : 329,988.50 = 329,988.50 : x
2. Step 2: Convert to fraction form
   218,948/329,988.50 = 329,988.50/x
3. Step 3: Cross multiply
   218,948x = 329,988.50 × 329,988.50
4. Step 4: Simplify right side
   218,948x = 108,892,410,132.25
5. Step 5: Solve for x
   x = 108,892,410,132.25/218,948
6. Step 6: Final answer
   x = 497,343.71