Finding the Fourth Proportional to 2,580.72, 3,561.36 and 1,401.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,580.72 : 3,561.36 = 1,401.78 : x
2. Step 2: Convert to fraction form
   2,580.72/3,561.36 = 1,401.78/x
3. Step 3: Cross multiply
   2,580.72x = 3,561.36 × 1,401.78
4. Step 4: Simplify right side
   2,580.72x = 4,992,243.22
5. Step 5: Solve for x
   x = 4,992,243.22/2,580.72
6. Step 6: Final answer
   x = 1,934.44