Finding the Fourth Proportional to 2,087.40, 2,880.72 and 1,155.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.40 : 2,880.72 = 1,155.96 : x
2. Step 2: Convert to fraction form
   2,087.40/2,880.72 = 1,155.96/x
3. Step 3: Cross multiply
   2,087.40x = 2,880.72 × 1,155.96
4. Step 4: Simplify right side
   2,087.40x = 3,329,997.09
5. Step 5: Solve for x
   x = 3,329,997.09/2,087.40
6. Step 6: Final answer
   x = 1,595.28