Finding the Fourth Proportional to 2,869.40, 3,958.62 and 2,081.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,869.40 : 3,958.62 = 2,081.72 : x
2. Step 2: Convert to fraction form
   2,869.40/3,958.62 = 2,081.72/x
3. Step 3: Cross multiply
   2,869.40x = 3,958.62 × 2,081.72
4. Step 4: Simplify right side
   2,869.40x = 8,240,738.43
5. Step 5: Solve for x
   x = 8,240,738.43/2,869.40
6. Step 6: Final answer
   x = 2,871.94