Finding the Fourth Proportional to 3,871.78, 5,337.76 and 2,660.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,871.78 : 5,337.76 = 2,660.42 : x
2. Step 2: Convert to fraction form
   3,871.78/5,337.76 = 2,660.42/x
3. Step 3: Cross multiply
   3,871.78x = 5,337.76 × 2,660.42
4. Step 4: Simplify right side
   3,871.78x = 14,200,683.46
5. Step 5: Solve for x
   x = 14,200,683.46/3,871.78
6. Step 6: Final answer
   x = 3,667.74