Finding the Fourth Proportional to 325,339.42, 487,160.31 and 261,812.55

Step by Step Solution

1. Step 1: Write the proportion equation
   325,339.42 : 487,160.31 = 261,812.55 : x
2. Step 2: Convert to fraction form
   325,339.42/487,160.31 = 261,812.55/x
3. Step 3: Cross multiply
   325,339.42x = 487,160.31 × 261,812.55
4. Step 4: Simplify right side
   325,339.42x = 127,544,683,019.89
5. Step 5: Solve for x
   x = 127,544,683,019.89/325,339.42
6. Step 6: Final answer
   x = 392,035.75