Finding the Third Proportional to 128,661.75 and 283,500

Step by Step Solution

1. Step 1: Write the proportion equation
   128,661.75 : 283,500 = 283,500 : x
2. Step 2: Convert to fraction form
   128,661.75/283,500 = 283,500/x
3. Step 3: Cross multiply
   128,661.75x = 283,500 × 283,500
4. Step 4: Simplify right side
   128,661.75x = 80,372,250,000
5. Step 5: Solve for x
   x = 80,372,250,000/128,661.75
6. Step 6: Final answer
   x = 624,678.66