Finding the Fourth Proportional to 354,858.84, 488,462.20 and 309,456.72

Step by Step Solution

1. Step 1: Write the proportion equation
   354,858.84 : 488,462.20 = 309,456.72 : x
2. Step 2: Convert to fraction form
   354,858.84/488,462.20 = 309,456.72/x
3. Step 3: Cross multiply
   354,858.84x = 488,462.20 × 309,456.72
4. Step 4: Simplify right side
   354,858.84x = 151,157,910,255.98
5. Step 5: Solve for x
   x = 151,157,910,255.98/354,858.84
6. Step 6: Final answer
   x = 425,966.31