Finding the Third Proportional to 128,812.50 and 280,506

Step by Step Solution

1. Step 1: Write the proportion equation
   128,812.50 : 280,506 = 280,506 : x
2. Step 2: Convert to fraction form
   128,812.50/280,506 = 280,506/x
3. Step 3: Cross multiply
   128,812.50x = 280,506 × 280,506
4. Step 4: Simplify right side
   128,812.50x = 78,683,616,036
5. Step 5: Solve for x
   x = 78,683,616,036/128,812.50
6. Step 6: Final answer
   x = 610,838.36