Finding the Third Proportional to 216.56 and 323.06

Step by Step Solution

1. Step 1: Write the proportion equation
   216.56 : 323.06 = 323.06 : x
2. Step 2: Convert to fraction form
   216.56/323.06 = 323.06/x
3. Step 3: Cross multiply
   216.56x = 323.06 × 323.06
4. Step 4: Simplify right side
   216.56x = 104,369.38
5. Step 5: Solve for x
   x = 104,369.38/216.56
6. Step 6: Final answer
   x = 481.94