Finding the Fourth Proportional to 2,568.66, 3,544.70 and 1,389.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,568.66 : 3,544.70 = 1,389.72 : x
2. Step 2: Convert to fraction form
   2,568.66/3,544.70 = 1,389.72/x
3. Step 3: Cross multiply
   2,568.66x = 3,544.70 × 1,389.72
4. Step 4: Simplify right side
   2,568.66x = 4,926,140.48
5. Step 5: Solve for x
   x = 4,926,140.48/2,568.66
6. Step 6: Final answer
   x = 1,917.79