Finding the Fourth Proportional to 2,087.76, 2,842.56 and 2,081.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.76 : 2,842.56 = 2,081.28 : x
2. Step 2: Convert to fraction form
   2,087.76/2,842.56 = 2,081.28/x
3. Step 3: Cross multiply
   2,087.76x = 2,842.56 × 2,081.28
4. Step 4: Simplify right side
   2,087.76x = 5,916,163.28
5. Step 5: Solve for x
   x = 5,916,163.28/2,087.76
6. Step 6: Final answer
   x = 2,833.74