Finding the Third Proportional to 129,829.50 and 287,833.50

Step by Step Solution

1. Step 1: Write the proportion equation
   129,829.50 : 287,833.50 = 287,833.50 : x
2. Step 2: Convert to fraction form
   129,829.50/287,833.50 = 287,833.50/x
3. Step 3: Cross multiply
   129,829.50x = 287,833.50 × 287,833.50
4. Step 4: Simplify right side
   129,829.50x = 82,848,123,722.25
5. Step 5: Solve for x
   x = 82,848,123,722.25/129,829.50
6. Step 6: Final answer
   x = 638,130.19