Finding the Fourth Proportional to 2,087.31, 2,880.52 and 1,143.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.31 : 2,880.52 = 1,143.09 : x
2. Step 2: Convert to fraction form
   2,087.31/2,880.52 = 1,143.09/x
3. Step 3: Cross multiply
   2,087.31x = 2,880.52 × 1,143.09
4. Step 4: Simplify right side
   2,087.31x = 3,292,690.68
5. Step 5: Solve for x
   x = 3,292,690.68/2,087.31
6. Step 6: Final answer
   x = 1,577.48