Finding the Fourth Proportional to 2,569.39, 3,545.75 and 1,390.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,569.39 : 3,545.75 = 1,390.48 : x
2. Step 2: Convert to fraction form
   2,569.39/3,545.75 = 1,390.48/x
3. Step 3: Cross multiply
   2,569.39x = 3,545.75 × 1,390.48
4. Step 4: Simplify right side
   2,569.39x = 4,930,269.78
5. Step 5: Solve for x
   x = 4,930,269.78/2,569.39
6. Step 6: Final answer
   x = 1,918.85