Finding the Third Proportional to 128,746.50 and 280,368

Step by Step Solution

1. Step 1: Write the proportion equation
   128,746.50 : 280,368 = 280,368 : x
2. Step 2: Convert to fraction form
   128,746.50/280,368 = 280,368/x
3. Step 3: Cross multiply
   128,746.50x = 280,368 × 280,368
4. Step 4: Simplify right side
   128,746.50x = 78,606,215,424
5. Step 5: Solve for x
   x = 78,606,215,424/128,746.50
6. Step 6: Final answer
   x = 610,550.31