Finding the Fourth Proportional to 10,889.65, 16,339.88 and 4,315.69

Step by Step Solution

1. Step 1: Write the proportion equation
   10,889.65 : 16,339.88 = 4,315.69 : x
2. Step 2: Convert to fraction form
   10,889.65/16,339.88 = 4,315.69/x
3. Step 3: Cross multiply
   10,889.65x = 16,339.88 × 4,315.69
4. Step 4: Simplify right side
   10,889.65x = 70,517,856.72
5. Step 5: Solve for x
   x = 70,517,856.72/10,889.65
6. Step 6: Final answer
   x = 6,475.68