Finding the Third Proportional to 296,655 and 639,508.50

Step by Step Solution

1. Step 1: Write the proportion equation
   296,655 : 639,508.50 = 639,508.50 : x
2. Step 2: Convert to fraction form
   296,655/639,508.50 = 639,508.50/x
3. Step 3: Cross multiply
   296,655x = 639,508.50 × 639,508.50
4. Step 4: Simplify right side
   296,655x = 408,971,121,572.25
5. Step 5: Solve for x
   x = 408,971,121,572.25/296,655
6. Step 6: Final answer
   x = 1,378,608.56