Finding the Third Proportional to 129,298,240.50 and 287,294,290.50

Step by Step Solution

1. Step 1: Write the proportion equation
   129,298,240.50 : 287,294,290.50 = 287,294,290.50 : x
2. Step 2: Convert to fraction form
   129,298,240.50/287,294,290.50 = 287,294,290.50/x
3. Step 3: Cross multiply
   129,298,240.50x = 287,294,290.50 × 287,294,290.50
4. Step 4: Simplify right side
   129,298,240.50x = 82,538,009,353,898,384
5. Step 5: Solve for x
   x = 82,538,009,353,898,384/129,298,240.50
6. Step 6: Final answer
   x = 638,353,693.25