Finding the Third Proportional to 42.75 and 64.88

Step by Step Solution

1. Step 1: Write the proportion equation
   42.75 : 64.88 = 64.88 : x
2. Step 2: Convert to fraction form
   42.75/64.88 = 64.88/x
3. Step 3: Cross multiply
   42.75x = 64.88 × 64.88
4. Step 4: Simplify right side
   42.75x = 4,208.77
5. Step 5: Solve for x
   x = 4,208.77/42.75
6. Step 6: Final answer
   x = 98.45