Finding the Third Proportional to 215.16 and 333.49

Step by Step Solution

1. Step 1: Write the proportion equation
   215.16 : 333.49 = 333.49 : x
2. Step 2: Convert to fraction form
   215.16/333.49 = 333.49/x
3. Step 3: Cross multiply
   215.16x = 333.49 × 333.49
4. Step 4: Simplify right side
   215.16x = 111,217.04
5. Step 5: Solve for x
   x = 111,217.04/215.16
6. Step 6: Final answer
   x = 516.91