Finding the Third Proportional to 122.72 and 228.78

Step by Step Solution

1. Step 1: Write the proportion equation
   122.72 : 228.78 = 228.78 : x
2. Step 2: Convert to fraction form
   122.72/228.78 = 228.78/x
3. Step 3: Cross multiply
   122.72x = 228.78 × 228.78
4. Step 4: Simplify right side
   122.72x = 52,340.86
5. Step 5: Solve for x
   x = 52,340.86/122.72
6. Step 6: Final answer
   x = 426.51