Finding the Third Proportional to 129,610 and 268,217.50

Step by Step Solution

1. Step 1: Write the proportion equation
   129,610 : 268,217.50 = 268,217.50 : x
2. Step 2: Convert to fraction form
   129,610/268,217.50 = 268,217.50/x
3. Step 3: Cross multiply
   129,610x = 268,217.50 × 268,217.50
4. Step 4: Simplify right side
   129,610x = 71,940,627,306.25
5. Step 5: Solve for x
   x = 71,940,627,306.25/129,610
6. Step 6: Final answer
   x = 555,054.60