Finding the Third Proportional to 42.27 and 64.68

Step by Step Solution

1. Step 1: Write the proportion equation
   42.27 : 64.68 = 64.68 : x
2. Step 2: Convert to fraction form
   42.27/64.68 = 64.68/x
3. Step 3: Cross multiply
   42.27x = 64.68 × 64.68
4. Step 4: Simplify right side
   42.27x = 4,183.46
5. Step 5: Solve for x
   x = 4,183.46/42.27
6. Step 6: Final answer
   x = 98.98