Finding the Third Proportional to 639.50 and 951.88

Step by Step Solution

1. Step 1: Write the proportion equation
   639.50 : 951.88 = 951.88 : x
2. Step 2: Convert to fraction form
   639.50/951.88 = 951.88/x
3. Step 3: Cross multiply
   639.50x = 951.88 × 951.88
4. Step 4: Simplify right side
   639.50x = 906,066.02
5. Step 5: Solve for x
   x = 906,066.02/639.50
6. Step 6: Final answer
   x = 1,416.84