Finding the Fourth Proportional to 2,280.94, 3,147.78 and 1,396.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,280.94 : 3,147.78 = 1,396.78 : x
2. Step 2: Convert to fraction form
   2,280.94/3,147.78 = 1,396.78/x
3. Step 3: Cross multiply
   2,280.94x = 3,147.78 × 1,396.78
4. Step 4: Simplify right side
   2,280.94x = 4,396,756.15
5. Step 5: Solve for x
   x = 4,396,756.15/2,280.94
6. Step 6: Final answer
   x = 1,927.61