Finding the Fourth Proportional to 354,123.59, 488,690.55 and 192,978.79

Step by Step Solution

1. Step 1: Write the proportion equation
   354,123.59 : 488,690.55 = 192,978.79 : x
2. Step 2: Convert to fraction form
   354,123.59/488,690.55 = 192,978.79/x
3. Step 3: Cross multiply
   354,123.59x = 488,690.55 × 192,978.79
4. Step 4: Simplify right side
   354,123.59x = 94,306,909,801.71
5. Step 5: Solve for x
   x = 94,306,909,801.71/354,123.59
6. Step 6: Final answer
   x = 266,310.73