Finding the Fourth Proportional to 2,568.53, 3,544.55 and 1,389.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,568.53 : 3,544.55 = 1,389.60 : x
2. Step 2: Convert to fraction form
   2,568.53/3,544.55 = 1,389.60/x
3. Step 3: Cross multiply
   2,568.53x = 3,544.55 × 1,389.60
4. Step 4: Simplify right side
   2,568.53x = 4,925,482.01
5. Step 5: Solve for x
   x = 4,925,482.01/2,568.53
6. Step 6: Final answer
   x = 1,917.63