Finding the Third Proportional to 218.88 and 446.69

Step by Step Solution

1. Step 1: Write the proportion equation
   218.88 : 446.69 = 446.69 : x
2. Step 2: Convert to fraction form
   218.88/446.69 = 446.69/x
3. Step 3: Cross multiply
   218.88x = 446.69 × 446.69
4. Step 4: Simplify right side
   218.88x = 199,529.72
5. Step 5: Solve for x
   x = 199,529.72/218.88
6. Step 6: Final answer
   x = 911.61