Finding the Fourth Proportional to 495,534.72, 683,818.56 and 280,686.72

Step by Step Solution

1. Step 1: Write the proportion equation
   495,534.72 : 683,818.56 = 280,686.72 : x
2. Step 2: Convert to fraction form
   495,534.72/683,818.56 = 280,686.72/x
3. Step 3: Cross multiply
   495,534.72x = 683,818.56 × 280,686.72
4. Step 4: Simplify right side
   495,534.72x = 191,938,788,681.52
5. Step 5: Solve for x
   x = 191,938,788,681.52/495,534.72
6. Step 6: Final answer
   x = 387,336.71