Finding the Fourth Proportional to 2,569.50, 3,545.91 and 1,390.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,569.50 : 3,545.91 = 1,390.58 : x
2. Step 2: Convert to fraction form
   2,569.50/3,545.91 = 1,390.58/x
3. Step 3: Cross multiply
   2,569.50x = 3,545.91 × 1,390.58
4. Step 4: Simplify right side
   2,569.50x = 4,930,867.10
5. Step 5: Solve for x
   x = 4,930,867.10/2,569.50
6. Step 6: Final answer
   x = 1,919.00