Finding the Third Proportional to 128,184.50 and 280,505

Step by Step Solution

1. Step 1: Write the proportion equation
   128,184.50 : 280,505 = 280,505 : x
2. Step 2: Convert to fraction form
   128,184.50/280,505 = 280,505/x
3. Step 3: Cross multiply
   128,184.50x = 280,505 × 280,505
4. Step 4: Simplify right side
   128,184.50x = 78,683,055,025
5. Step 5: Solve for x
   x = 78,683,055,025/128,184.50
6. Step 6: Final answer
   x = 613,826.59