Finding the Third Proportional to 219,915 and 328,900.50

Step by Step Solution

1. Step 1: Write the proportion equation
   219,915 : 328,900.50 = 328,900.50 : x
2. Step 2: Convert to fraction form
   219,915/328,900.50 = 328,900.50/x
3. Step 3: Cross multiply
   219,915x = 328,900.50 × 328,900.50
4. Step 4: Simplify right side
   219,915x = 108,175,538,900.25
5. Step 5: Solve for x
   x = 108,175,538,900.25/219,915
6. Step 6: Final answer
   x = 491,897.05