Finding the Fourth Proportional to 499,562.39, 689,413.55 and 284,667.77

Step by Step Solution

1. Step 1: Write the proportion equation
   499,562.39 : 689,413.55 = 284,667.77 : x
2. Step 2: Convert to fraction form
   499,562.39/689,413.55 = 284,667.77/x
3. Step 3: Cross multiply
   499,562.39x = 689,413.55 × 284,667.77
4. Step 4: Simplify right side
   499,562.39x = 196,253,813,015.88
5. Step 5: Solve for x
   x = 196,253,813,015.88/499,562.39
6. Step 6: Final answer
   x = 392,851.46