Finding the Fourth Proportional to 2,580.78, 3,561.50 and 1,401.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,580.78 : 3,561.50 = 1,401.86 : x
2. Step 2: Convert to fraction form
   2,580.78/3,561.50 = 1,401.86/x
3. Step 3: Cross multiply
   2,580.78x = 3,561.50 × 1,401.86
4. Step 4: Simplify right side
   2,580.78x = 4,992,724.39
5. Step 5: Solve for x
   x = 4,992,724.39/2,580.78
6. Step 6: Final answer
   x = 1,934.58