Finding the Fourth Proportional to 2,569.08, 3,545.33 and 1,390.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,569.08 : 3,545.33 = 1,390.15 : x
2. Step 2: Convert to fraction form
   2,569.08/3,545.33 = 1,390.15/x
3. Step 3: Cross multiply
   2,569.08x = 3,545.33 × 1,390.15
4. Step 4: Simplify right side
   2,569.08x = 4,928,540.50
5. Step 5: Solve for x
   x = 4,928,540.50/2,569.08
6. Step 6: Final answer
   x = 1,918.41