Finding the Third Proportional to 647.88 and 908.50

Step by Step Solution

1. Step 1: Write the proportion equation
   647.88 : 908.50 = 908.50 : x
2. Step 2: Convert to fraction form
   647.88/908.50 = 908.50/x
3. Step 3: Cross multiply
   647.88x = 908.50 × 908.50
4. Step 4: Simplify right side
   647.88x = 825,372.25
5. Step 5: Solve for x
   x = 825,372.25/647.88
6. Step 6: Final answer
   x = 1,273.97