Finding the Fourth Proportional to 2,568.16, 3,544.04 and 1,389.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,568.16 : 3,544.04 = 1,389.20 : x
2. Step 2: Convert to fraction form
   2,568.16/3,544.04 = 1,389.20/x
3. Step 3: Cross multiply
   2,568.16x = 3,544.04 × 1,389.20
4. Step 4: Simplify right side
   2,568.16x = 4,923,392.70
5. Step 5: Solve for x
   x = 4,923,392.70/2,568.16
6. Step 6: Final answer
   x = 1,917.09