Finding the Third Proportional to 216.42 and 222.89

Step by Step Solution

1. Step 1: Write the proportion equation
   216.42 : 222.89 = 222.89 : x
2. Step 2: Convert to fraction form
   216.42/222.89 = 222.89/x
3. Step 3: Cross multiply
   216.42x = 222.89 × 222.89
4. Step 4: Simplify right side
   216.42x = 49,680.23
5. Step 5: Solve for x
   x = 49,680.23/216.42
6. Step 6: Final answer
   x = 229.55