Finding the Third Proportional to 129,702.75 and 200,308.50

Step by Step Solution

1. Step 1: Write the proportion equation
   129,702.75 : 200,308.50 = 200,308.50 : x
2. Step 2: Convert to fraction form
   129,702.75/200,308.50 = 200,308.50/x
3. Step 3: Cross multiply
   129,702.75x = 200,308.50 × 200,308.50
4. Step 4: Simplify right side
   129,702.75x = 40,123,495,172.25
5. Step 5: Solve for x
   x = 40,123,495,172.25/129,702.75
6. Step 6: Final answer
   x = 309,349.61