Finding the Fourth Proportional to 495,359.28, 683,603.72 and 280,493.52

Step by Step Solution

1. Step 1: Write the proportion equation
   495,359.28 : 683,603.72 = 280,493.52 : x
2. Step 2: Convert to fraction form
   495,359.28/683,603.72 = 280,493.52/x
3. Step 3: Cross multiply
   495,359.28x = 683,603.72 × 280,493.52
4. Step 4: Simplify right side
   495,359.28x = 191,746,413,707.89
5. Step 5: Solve for x
   x = 191,746,413,707.89/495,359.28
6. Step 6: Final answer
   x = 387,085.54