Finding the Fourth Proportional to 10,689.49, 16,037.72 and 5,143.28

Step by Step Solution

1. Step 1: Write the proportion equation
   10,689.49 : 16,037.72 = 5,143.28 : x
2. Step 2: Convert to fraction form
   10,689.49/16,037.72 = 5,143.28/x
3. Step 3: Cross multiply
   10,689.49x = 16,037.72 × 5,143.28
4. Step 4: Simplify right side
   10,689.49x = 82,486,458.81
5. Step 5: Solve for x
   x = 82,486,458.81/10,689.49
6. Step 6: Final answer
   x = 7,716.60