Finding the Third Proportional to 60.69 and 128.56

Step by Step Solution

1. Step 1: Write the proportion equation
   60.69 : 128.56 = 128.56 : x
2. Step 2: Convert to fraction form
   60.69/128.56 = 128.56/x
3. Step 3: Cross multiply
   60.69x = 128.56 × 128.56
4. Step 4: Simplify right side
   60.69x = 16,528.32
5. Step 5: Solve for x
   x = 16,528.32/60.69
6. Step 6: Final answer
   x = 272.35