Finding the Fourth Proportional to 2,160.57, 2,978.86 and 1,413.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,160.57 : 2,978.86 = 1,413.35 : x
2. Step 2: Convert to fraction form
   2,160.57/2,978.86 = 1,413.35/x
3. Step 3: Cross multiply
   2,160.57x = 2,978.86 × 1,413.35
4. Step 4: Simplify right side
   2,160.57x = 4,210,153.35
5. Step 5: Solve for x
   x = 4,210,153.35/2,160.57
6. Step 6: Final answer
   x = 1,948.63