Finding the Fourth Proportional to 3,413.62, 4,713.72 and 2,156.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,413.62 : 4,713.72 = 2,156.86 : x
2. Step 2: Convert to fraction form
   3,413.62/4,713.72 = 2,156.86/x
3. Step 3: Cross multiply
   3,413.62x = 4,713.72 × 2,156.86
4. Step 4: Simplify right side
   3,413.62x = 10,166,834.12
5. Step 5: Solve for x
   x = 10,166,834.12/3,413.62
6. Step 6: Final answer
   x = 2,978.31