Finding the Third Proportional to 129,298,234.50 and 287,294,278.50

Step by Step Solution

1. Step 1: Write the proportion equation
   129,298,234.50 : 287,294,278.50 = 287,294,278.50 : x
2. Step 2: Convert to fraction form
   129,298,234.50/287,294,278.50 = 287,294,278.50/x
3. Step 3: Cross multiply
   129,298,234.50x = 287,294,278.50 × 287,294,278.50
4. Step 4: Simplify right side
   129,298,234.50x = 82,538,002,458,835,568
5. Step 5: Solve for x
   x = 82,538,002,458,835,568/129,298,234.50
6. Step 6: Final answer
   x = 638,353,669.55