Finding the Fourth Proportional to 2,568.81, 3,544.93 and 1,389.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,568.81 : 3,544.93 = 1,389.86 : x
2. Step 2: Convert to fraction form
   2,568.81/3,544.93 = 1,389.86/x
3. Step 3: Cross multiply
   2,568.81x = 3,544.93 × 1,389.86
4. Step 4: Simplify right side
   2,568.81x = 4,926,953.72
5. Step 5: Solve for x
   x = 4,926,953.72/2,568.81
6. Step 6: Final answer
   x = 1,917.99