Finding the Third Proportional to 648.25 and 985.88

Step by Step Solution

1. Step 1: Write the proportion equation
   648.25 : 985.88 = 985.88 : x
2. Step 2: Convert to fraction form
   648.25/985.88 = 985.88/x
3. Step 3: Cross multiply
   648.25x = 985.88 × 985.88
4. Step 4: Simplify right side
   648.25x = 971,949.52
5. Step 5: Solve for x
   x = 971,949.52/648.25
6. Step 6: Final answer
   x = 1,499.34