Finding the Fourth Proportional to 2,568.33, 3,544.29 and 1,389.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,568.33 : 3,544.29 = 1,389.40 : x
2. Step 2: Convert to fraction form
   2,568.33/3,544.29 = 1,389.40/x
3. Step 3: Cross multiply
   2,568.33x = 3,544.29 × 1,389.40
4. Step 4: Simplify right side
   2,568.33x = 4,924,436.53
5. Step 5: Solve for x
   x = 4,924,436.53/2,568.33
6. Step 6: Final answer
   x = 1,917.37