Finding the Fourth Proportional to 3,710.91, 5,121.30 and 2,139.10

Step by Step Solution

1. Step 1: Write the proportion equation
   3,710.91 : 5,121.30 = 2,139.10 : x
2. Step 2: Convert to fraction form
   3,710.91/5,121.30 = 2,139.10/x
3. Step 3: Cross multiply
   3,710.91x = 5,121.30 × 2,139.10
4. Step 4: Simplify right side
   3,710.91x = 10,954,972.83
5. Step 5: Solve for x
   x = 10,954,972.83/3,710.91
6. Step 6: Final answer
   x = 2,952.10