Finding the Third Proportional to 131,287.50 and 287,739

Step by Step Solution

1. Step 1: Write the proportion equation
   131,287.50 : 287,739 = 287,739 : x
2. Step 2: Convert to fraction form
   131,287.50/287,739 = 287,739/x
3. Step 3: Cross multiply
   131,287.50x = 287,739 × 287,739
4. Step 4: Simplify right side
   131,287.50x = 82,793,732,121
5. Step 5: Solve for x
   x = 82,793,732,121/131,287.50
6. Step 6: Final answer
   x = 630,629.21