Finding the Fourth Proportional to 2,618.28, 3,928.78 and 1,158.44

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.28 : 3,928.78 = 1,158.44 : x
2. Step 2: Convert to fraction form
   2,618.28/3,928.78 = 1,158.44/x
3. Step 3: Cross multiply
   2,618.28x = 3,928.78 × 1,158.44
4. Step 4: Simplify right side
   2,618.28x = 4,551,255.90
5. Step 5: Solve for x
   x = 4,551,255.90/2,618.28
6. Step 6: Final answer
   x = 1,738.26