Finding the Fourth Proportional to 10,288.71, 15,431.85 and 2,689.49

Step by Step Solution

1. Step 1: Write the proportion equation
   10,288.71 : 15,431.85 = 2,689.49 : x
2. Step 2: Convert to fraction form
   10,288.71/15,431.85 = 2,689.49/x
3. Step 3: Cross multiply
   10,288.71x = 15,431.85 × 2,689.49
4. Step 4: Simplify right side
   10,288.71x = 41,503,729.10
5. Step 5: Solve for x
   x = 41,503,729.10/10,288.71
6. Step 6: Final answer
   x = 4,033.91