Finding the Fourth Proportional to 3,871.10, 5,342.13 and 2,102.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,871.10 : 5,342.13 = 2,102.72 : x
2. Step 2: Convert to fraction form
   3,871.10/5,342.13 = 2,102.72/x
3. Step 3: Cross multiply
   3,871.10x = 5,342.13 × 2,102.72
4. Step 4: Simplify right side
   3,871.10x = 11,233,003.59
5. Step 5: Solve for x
   x = 11,233,003.59/3,871.10
6. Step 6: Final answer
   x = 2,901.76