Finding the Third Proportional to 648.50 and 708.50

Step by Step Solution

1. Step 1: Write the proportion equation
   648.50 : 708.50 = 708.50 : x
2. Step 2: Convert to fraction form
   648.50/708.50 = 708.50/x
3. Step 3: Cross multiply
   648.50x = 708.50 × 708.50
4. Step 4: Simplify right side
   648.50x = 501,972.25
5. Step 5: Solve for x
   x = 501,972.25/648.50
6. Step 6: Final answer
   x = 774.05