Finding the Third Proportional to 57.94 and 86.69

Step by Step Solution

1. Step 1: Write the proportion equation
   57.94 : 86.69 = 86.69 : x
2. Step 2: Convert to fraction form
   57.94/86.69 = 86.69/x
3. Step 3: Cross multiply
   57.94x = 86.69 × 86.69
4. Step 4: Simplify right side
   57.94x = 7,514.72
5. Step 5: Solve for x
   x = 7,514.72/57.94
6. Step 6: Final answer
   x = 129.70