Finding the Third Proportional to 124.78 and 229.31

Step by Step Solution

1. Step 1: Write the proportion equation
   124.78 : 229.31 = 229.31 : x
2. Step 2: Convert to fraction form
   124.78/229.31 = 229.31/x
3. Step 3: Cross multiply
   124.78x = 229.31 × 229.31
4. Step 4: Simplify right side
   124.78x = 52,584.22
5. Step 5: Solve for x
   x = 52,584.22/124.78
6. Step 6: Final answer
   x = 421.41