Finding the Fourth Proportional to 2,560.72, 3,529.96 and 2,087.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,560.72 : 3,529.96 = 2,087.89 : x
2. Step 2: Convert to fraction form
   2,560.72/3,529.96 = 2,087.89/x
3. Step 3: Cross multiply
   2,560.72x = 3,529.96 × 2,087.89
4. Step 4: Simplify right side
   2,560.72x = 7,370,171.79
5. Step 5: Solve for x
   x = 7,370,171.79/2,560.72
6. Step 6: Final answer
   x = 2,878.16