Finding the Third Proportional to 129,330 and 200,719.50

Step by Step Solution

1. Step 1: Write the proportion equation
   129,330 : 200,719.50 = 200,719.50 : x
2. Step 2: Convert to fraction form
   129,330/200,719.50 = 200,719.50/x
3. Step 3: Cross multiply
   129,330x = 200,719.50 × 200,719.50
4. Step 4: Simplify right side
   129,330x = 40,288,317,680.25
5. Step 5: Solve for x
   x = 40,288,317,680.25/129,330
6. Step 6: Final answer
   x = 311,515.64