Finding the Fourth Proportional to 2,568.47, 3,544.50 and 1,389.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,568.47 : 3,544.50 = 1,389.55 : x
2. Step 2: Convert to fraction form
   2,568.47/3,544.50 = 1,389.55/x
3. Step 3: Cross multiply
   2,568.47x = 3,544.50 × 1,389.55
4. Step 4: Simplify right side
   2,568.47x = 4,925,259.98
5. Step 5: Solve for x
   x = 4,925,259.98/2,568.47
6. Step 6: Final answer
   x = 1,917.59