Finding the Third Proportional to 391.50 and 433.69

Step by Step Solution

1. Step 1: Write the proportion equation
   391.50 : 433.69 = 433.69 : x
2. Step 2: Convert to fraction form
   391.50/433.69 = 433.69/x
3. Step 3: Cross multiply
   391.50x = 433.69 × 433.69
4. Step 4: Simplify right side
   391.50x = 188,084.85
5. Step 5: Solve for x
   x = 188,084.85/391.50
6. Step 6: Final answer
   x = 480.42