Finding the Third Proportional to 129,387 and 193,540.50

Step by Step Solution

1. Step 1: Write the proportion equation
   129,387 : 193,540.50 = 193,540.50 : x
2. Step 2: Convert to fraction form
   129,387/193,540.50 = 193,540.50/x
3. Step 3: Cross multiply
   129,387x = 193,540.50 × 193,540.50
4. Step 4: Simplify right side
   129,387x = 37,457,925,140.25
5. Step 5: Solve for x
   x = 37,457,925,140.25/129,387
6. Step 6: Final answer
   x = 289,503.00