Finding the Fourth Proportional to 3,856.08, 5,321.42 and 2,087.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,856.08 : 5,321.42 = 2,087.72 : x
2. Step 2: Convert to fraction form
   3,856.08/5,321.42 = 2,087.72/x
3. Step 3: Cross multiply
   3,856.08x = 5,321.42 × 2,087.72
4. Step 4: Simplify right side
   3,856.08x = 11,109,634.96
5. Step 5: Solve for x
   x = 11,109,634.96/3,856.08
6. Step 6: Final answer
   x = 2,881.07