Finding the Third Proportional to 104.50 and 216.31

Step by Step Solution

1. Step 1: Write the proportion equation
   104.50 : 216.31 = 216.31 : x
2. Step 2: Convert to fraction form
   104.50/216.31 = 216.31/x
3. Step 3: Cross multiply
   104.50x = 216.31 × 216.31
4. Step 4: Simplify right side
   104.50x = 46,791.10
5. Step 5: Solve for x
   x = 46,791.10/104.50
6. Step 6: Final answer
   x = 447.76