Finding the Fourth Proportional to 2,928.52, 4,390.28 and 1,078.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,928.52 : 4,390.28 = 1,078.71 : x
2. Step 2: Convert to fraction form
   2,928.52/4,390.28 = 1,078.71/x
3. Step 3: Cross multiply
   2,928.52x = 4,390.28 × 1,078.71
4. Step 4: Simplify right side
   2,928.52x = 4,735,838.94
5. Step 5: Solve for x
   x = 4,735,838.94/2,928.52
6. Step 6: Final answer
   x = 1,617.14