Finding the Third Proportional to 128,281.50 and 280,701

Step by Step Solution

1. Step 1: Write the proportion equation
   128,281.50 : 280,701 = 280,701 : x
2. Step 2: Convert to fraction form
   128,281.50/280,701 = 280,701/x
3. Step 3: Cross multiply
   128,281.50x = 280,701 × 280,701
4. Step 4: Simplify right side
   128,281.50x = 78,793,051,401
5. Step 5: Solve for x
   x = 78,793,051,401/128,281.50
6. Step 6: Final answer
   x = 614,219.91