Finding the Third Proportional to 219.56 and 446.72

Step by Step Solution

1. Step 1: Write the proportion equation
   219.56 : 446.72 = 446.72 : x
2. Step 2: Convert to fraction form
   219.56/446.72 = 446.72/x
3. Step 3: Cross multiply
   219.56x = 446.72 × 446.72
4. Step 4: Simplify right side
   219.56x = 199,557.64
5. Step 5: Solve for x
   x = 199,557.64/219.56
6. Step 6: Final answer
   x = 908.89