Finding the Fourth Proportional to 425,636.42, 587,273.83 and 280,426.10

Step by Step Solution

1. Step 1: Write the proportion equation
   425,636.42 : 587,273.83 = 280,426.10 : x
2. Step 2: Convert to fraction form
   425,636.42/587,273.83 = 280,426.10/x
3. Step 3: Cross multiply
   425,636.42x = 587,273.83 × 280,426.10
4. Step 4: Simplify right side
   425,636.42x = 164,686,906,141.53
5. Step 5: Solve for x
   x = 164,686,906,141.53/425,636.42
6. Step 6: Final answer
   x = 386,919.21