Finding the Fourth Proportional to 3,900.29, 5,382.98 and 2,388.71

Step by Step Solution

1. Step 1: Write the proportion equation
   3,900.29 : 5,382.98 = 2,388.71 : x
2. Step 2: Convert to fraction form
   3,900.29/5,382.98 = 2,388.71/x
3. Step 3: Cross multiply
   3,900.29x = 5,382.98 × 2,388.71
4. Step 4: Simplify right side
   3,900.29x = 12,858,339.30
5. Step 5: Solve for x
   x = 12,858,339.30/3,900.29
6. Step 6: Final answer
   x = 3,296.77