Finding the Fourth Proportional to 10,890.47, 16,313.83 and 9,217.42

Step by Step Solution

1. Step 1: Write the proportion equation
   10,890.47 : 16,313.83 = 9,217.42 : x
2. Step 2: Convert to fraction form
   10,890.47/16,313.83 = 9,217.42/x
3. Step 3: Cross multiply
   10,890.47x = 16,313.83 × 9,217.42
4. Step 4: Simplify right side
   10,890.47x = 150,371,422.92
5. Step 5: Solve for x
   x = 150,371,422.92/10,890.47
6. Step 6: Final answer
   x = 13,807.62