Finding the Fourth Proportional to 2,568.16, 3,544.06 and 1,389.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,568.16 : 3,544.06 = 1,389.23 : x
2. Step 2: Convert to fraction form
   2,568.16/3,544.06 = 1,389.23/x
3. Step 3: Cross multiply
   2,568.16x = 3,544.06 × 1,389.23
4. Step 4: Simplify right side
   2,568.16x = 4,923,514.47
5. Step 5: Solve for x
   x = 4,923,514.47/2,568.16
6. Step 6: Final answer
   x = 1,917.14