Finding the Fourth Proportional to 2,569.20, 3,545.52 and 1,978.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,569.20 : 3,545.52 = 1,978.68 : x
2. Step 2: Convert to fraction form
   2,569.20/3,545.52 = 1,978.68/x
3. Step 3: Cross multiply
   2,569.20x = 3,545.52 × 1,978.68
4. Step 4: Simplify right side
   2,569.20x = 7,015,449.51
5. Step 5: Solve for x
   x = 7,015,449.51/2,569.20
6. Step 6: Final answer
   x = 2,730.60