Finding the Third Proportional to 117.28 and 223.78

Step by Step Solution

1. Step 1: Write the proportion equation
   117.28 : 223.78 = 223.78 : x
2. Step 2: Convert to fraction form
   117.28/223.78 = 223.78/x
3. Step 3: Cross multiply
   117.28x = 223.78 × 223.78
4. Step 4: Simplify right side
   117.28x = 50,078.05
5. Step 5: Solve for x
   x = 50,078.05/117.28
6. Step 6: Final answer
   x = 426.99