Finding the Third Proportional to 320.75 and 498.25

Step by Step Solution

1. Step 1: Write the proportion equation
   320.75 : 498.25 = 498.25 : x
2. Step 2: Convert to fraction form
   320.75/498.25 = 498.25/x
3. Step 3: Cross multiply
   320.75x = 498.25 × 498.25
4. Step 4: Simplify right side
   320.75x = 248,253.06
5. Step 5: Solve for x
   x = 248,253.06/320.75
6. Step 6: Final answer
   x = 773.98