Finding the Fourth Proportional to 2,087.91, 2,881.31 and 1,143.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.91 : 2,881.31 = 1,143.69 : x
2. Step 2: Convert to fraction form
   2,087.91/2,881.31 = 1,143.69/x
3. Step 3: Cross multiply
   2,087.91x = 2,881.31 × 1,143.69
4. Step 4: Simplify right side
   2,087.91x = 3,295,319.72
5. Step 5: Solve for x
   x = 3,295,319.72/2,087.91
6. Step 6: Final answer
   x = 1,578.29