Finding the Fourth Proportional to 10,898.46, 16,353.59 and 8,438.09

Step by Step Solution

1. Step 1: Write the proportion equation
   10,898.46 : 16,353.59 = 8,438.09 : x
2. Step 2: Convert to fraction form
   10,898.46/16,353.59 = 8,438.09/x
3. Step 3: Cross multiply
   10,898.46x = 16,353.59 × 8,438.09
4. Step 4: Simplify right side
   10,898.46x = 137,992,940.28
5. Step 5: Solve for x
   x = 137,992,940.28/10,898.46
6. Step 6: Final answer
   x = 12,661.69