Finding the Fourth Proportional to 2,568.54, 3,544.59 and 1,389.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,568.54 : 3,544.59 = 1,389.61 : x
2. Step 2: Convert to fraction form
   2,568.54/3,544.59 = 1,389.61/x
3. Step 3: Cross multiply
   2,568.54x = 3,544.59 × 1,389.61
4. Step 4: Simplify right side
   2,568.54x = 4,925,602.14
5. Step 5: Solve for x
   x = 4,925,602.14/2,568.54
6. Step 6: Final answer
   x = 1,917.67