Finding the Fourth Proportional to 2,561.77, 3,535.20 and 1,442.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,561.77 : 3,535.20 = 1,442.71 : x
2. Step 2: Convert to fraction form
   2,561.77/3,535.20 = 1,442.71/x
3. Step 3: Cross multiply
   2,561.77x = 3,535.20 × 1,442.71
4. Step 4: Simplify right side
   2,561.77x = 5,100,250.72
5. Step 5: Solve for x
   x = 5,100,250.72/2,561.77
6. Step 6: Final answer
   x = 1,990.91