Finding the Third Proportional to 128,793 and 280,469

Step by Step Solution

1. Step 1: Write the proportion equation
   128,793 : 280,469 = 280,469 : x
2. Step 2: Convert to fraction form
   128,793/280,469 = 280,469/x
3. Step 3: Cross multiply
   128,793x = 280,469 × 280,469
4. Step 4: Simplify right side
   128,793x = 78,662,859,961
5. Step 5: Solve for x
   x = 78,662,859,961/128,793
6. Step 6: Final answer
   x = 610,769.68