Finding the Fourth Proportional to 2,580.78, 3,561.49 and 1,401.85

Step by Step Solution

1. Step 1: Write the proportion equation
   2,580.78 : 3,561.49 = 1,401.85 : x
2. Step 2: Convert to fraction form
   2,580.78/3,561.49 = 1,401.85/x
3. Step 3: Cross multiply
   2,580.78x = 3,561.49 × 1,401.85
4. Step 4: Simplify right side
   2,580.78x = 4,992,665.85
5. Step 5: Solve for x
   x = 4,992,665.85/2,580.78
6. Step 6: Final answer
   x = 1,934.56