Finding the Fourth Proportional to 2,520.57, 3,778.43 and 1,288.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,520.57 : 3,778.43 = 1,288.56 : x
2. Step 2: Convert to fraction form
   2,520.57/3,778.43 = 1,288.56/x
3. Step 3: Cross multiply
   2,520.57x = 3,778.43 × 1,288.56
4. Step 4: Simplify right side
   2,520.57x = 4,868,727.32
5. Step 5: Solve for x
   x = 4,868,727.32/2,520.57
6. Step 6: Final answer
   x = 1,931.60