Finding the Third Proportional to 64.75 and 71.69

Step by Step Solution

1. Step 1: Write the proportion equation
   64.75 : 71.69 = 71.69 : x
2. Step 2: Convert to fraction form
   64.75/71.69 = 71.69/x
3. Step 3: Cross multiply
   64.75x = 71.69 × 71.69
4. Step 4: Simplify right side
   64.75x = 5,139.10
5. Step 5: Solve for x
   x = 5,139.10/64.75
6. Step 6: Final answer
   x = 79.37