Finding the Fourth Proportional to 2,665.48, 3,990.70 and 1,413.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,665.48 : 3,990.70 = 1,413.22 : x
2. Step 2: Convert to fraction form
   2,665.48/3,990.70 = 1,413.22/x
3. Step 3: Cross multiply
   2,665.48x = 3,990.70 × 1,413.22
4. Step 4: Simplify right side
   2,665.48x = 5,639,737.05
5. Step 5: Solve for x
   x = 5,639,737.05/2,665.48
6. Step 6: Final answer
   x = 2,115.84