Finding the Fourth Proportional to 2,568.74, 3,544.86 and 1,389.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,568.74 : 3,544.86 = 1,389.81 : x
2. Step 2: Convert to fraction form
   2,568.74/3,544.86 = 1,389.81/x
3. Step 3: Cross multiply
   2,568.74x = 3,544.86 × 1,389.81
4. Step 4: Simplify right side
   2,568.74x = 4,926,681.88
5. Step 5: Solve for x
   x = 4,926,681.88/2,568.74
6. Step 6: Final answer
   x = 1,917.94