Finding the Fourth Proportional to 3,871.59, 5,342.71 and 2,103.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,871.59 : 5,342.71 = 2,103.15 : x
2. Step 2: Convert to fraction form
   3,871.59/5,342.71 = 2,103.15/x
3. Step 3: Cross multiply
   3,871.59x = 5,342.71 × 2,103.15
4. Step 4: Simplify right side
   3,871.59x = 11,236,520.54
5. Step 5: Solve for x
   x = 11,236,520.54/3,871.59
6. Step 6: Final answer
   x = 2,902.30