Finding the Third Proportional to 42.09 and 64.27

Step by Step Solution

1. Step 1: Write the proportion equation
   42.09 : 64.27 = 64.27 : x
2. Step 2: Convert to fraction form
   42.09/64.27 = 64.27/x
3. Step 3: Cross multiply
   42.09x = 64.27 × 64.27
4. Step 4: Simplify right side
   42.09x = 4,130.07
5. Step 5: Solve for x
   x = 4,130.07/42.09
6. Step 6: Final answer
   x = 98.12