Finding the Fourth Proportional to 2,928.65, 4,390.47 and 1,078.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,928.65 : 4,390.47 = 1,078.83 : x
2. Step 2: Convert to fraction form
   2,928.65/4,390.47 = 1,078.83/x
3. Step 3: Cross multiply
   2,928.65x = 4,390.47 × 1,078.83
4. Step 4: Simplify right side
   2,928.65x = 4,736,570.75
5. Step 5: Solve for x
   x = 4,736,570.75/2,928.65
6. Step 6: Final answer
   x = 1,617.32