Finding the Fourth Proportional to 3,871.65, 5,342.89 and 2,103.25

Step by Step Solution

1. Step 1: Write the proportion equation
   3,871.65 : 5,342.89 = 2,103.25 : x
2. Step 2: Convert to fraction form
   3,871.65/5,342.89 = 2,103.25/x
3. Step 3: Cross multiply
   3,871.65x = 5,342.89 × 2,103.25
4. Step 4: Simplify right side
   3,871.65x = 11,237,433.39
5. Step 5: Solve for x
   x = 11,237,433.39/3,871.65
6. Step 6: Final answer
   x = 2,902.49