Finding the Fourth Proportional to 353,216.82, 488,722.76 and 307,989.05

Step by Step Solution

1. Step 1: Write the proportion equation
   353,216.82 : 488,722.76 = 307,989.05 : x
2. Step 2: Convert to fraction form
   353,216.82/488,722.76 = 307,989.05/x
3. Step 3: Cross multiply
   353,216.82x = 488,722.76 × 307,989.05
4. Step 4: Simplify right side
   353,216.82x = 150,521,258,565.78
5. Step 5: Solve for x
   x = 150,521,258,565.78/353,216.82
6. Step 6: Final answer
   x = 426,144.09