Finding the Fourth Proportional to 2,087.10, 2,880.08 and 1,142.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.10 : 2,880.08 = 1,142.70 : x
2. Step 2: Convert to fraction form
   2,087.10/2,880.08 = 1,142.70/x
3. Step 3: Cross multiply
   2,087.10x = 2,880.08 × 1,142.70
4. Step 4: Simplify right side
   2,087.10x = 3,291,061.70
5. Step 5: Solve for x
   x = 3,291,061.70/2,087.10
6. Step 6: Final answer
   x = 1,576.86