Finding the Fourth Proportional to 2,740.05, 4,111.38 and 1,278.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,740.05 : 4,111.38 = 1,278.99 : x
2. Step 2: Convert to fraction form
   2,740.05/4,111.38 = 1,278.99/x
3. Step 3: Cross multiply
   2,740.05x = 4,111.38 × 1,278.99
4. Step 4: Simplify right side
   2,740.05x = 5,258,413.91
5. Step 5: Solve for x
   x = 5,258,413.91/2,740.05
6. Step 6: Final answer
   x = 1,919.09