Finding the Fourth Proportional to 2,087.40, 2,859.21 and 2,081.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.40 : 2,859.21 = 2,081.64 : x
2. Step 2: Convert to fraction form
   2,087.40/2,859.21 = 2,081.64/x
3. Step 3: Cross multiply
   2,087.40x = 2,859.21 × 2,081.64
4. Step 4: Simplify right side
   2,087.40x = 5,951,845.90
5. Step 5: Solve for x
   x = 5,951,845.90/2,087.40
6. Step 6: Final answer
   x = 2,851.32