Finding the Fourth Proportional to 2,569.29, 3,545.60 and 1,390.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,569.29 : 3,545.60 = 1,390.34 : x
2. Step 2: Convert to fraction form
   2,569.29/3,545.60 = 1,390.34/x
3. Step 3: Cross multiply
   2,569.29x = 3,545.60 × 1,390.34
4. Step 4: Simplify right side
   2,569.29x = 4,929,564.82
5. Step 5: Solve for x
   x = 4,929,564.82/2,569.29
6. Step 6: Final answer
   x = 1,918.65