Finding the Third Proportional to 59.91 and 128.67

Step by Step Solution

1. Step 1: Write the proportion equation
   59.91 : 128.67 = 128.67 : x
2. Step 2: Convert to fraction form
   59.91/128.67 = 128.67/x
3. Step 3: Cross multiply
   59.91x = 128.67 × 128.67
4. Step 4: Simplify right side
   59.91x = 16,556.45
5. Step 5: Solve for x
   x = 16,556.45/59.91
6. Step 6: Final answer
   x = 276.37