Finding the Fourth Proportional to 2,928.94, 4,390.35 and 1,284.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,928.94 : 4,390.35 = 1,284.10 : x
2. Step 2: Convert to fraction form
   2,928.94/4,390.35 = 1,284.10/x
3. Step 3: Cross multiply
   2,928.94x = 4,390.35 × 1,284.10
4. Step 4: Simplify right side
   2,928.94x = 5,637,648.44
5. Step 5: Solve for x
   x = 5,637,648.44/2,928.94
6. Step 6: Final answer
   x = 1,924.81