Finding the Fourth Proportional to 2,569.18, 3,545.47 and 1,390.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,569.18 : 3,545.47 = 1,390.25 : x
2. Step 2: Convert to fraction form
   2,569.18/3,545.47 = 1,390.25/x
3. Step 3: Cross multiply
   2,569.18x = 3,545.47 × 1,390.25
4. Step 4: Simplify right side
   2,569.18x = 4,929,071.94
5. Step 5: Solve for x
   x = 4,929,071.94/2,569.18
6. Step 6: Final answer
   x = 1,918.54