Finding the Fourth Proportional to 2,568.96, 3,545.17 and 1,390.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,568.96 : 3,545.17 = 1,390.03 : x
2. Step 2: Convert to fraction form
   2,568.96/3,545.17 = 1,390.03/x
3. Step 3: Cross multiply
   2,568.96x = 3,545.17 × 1,390.03
4. Step 4: Simplify right side
   2,568.96x = 4,927,880.32
5. Step 5: Solve for x
   x = 4,927,880.32/2,568.96
6. Step 6: Final answer
   x = 1,918.24