Finding the Fourth Proportional to 16,216.33, 22,379.58 and 9,143.21

Step by Step Solution

1. Step 1: Write the proportion equation
   16,216.33 : 22,379.58 = 9,143.21 : x
2. Step 2: Convert to fraction form
   16,216.33/22,379.58 = 9,143.21/x
3. Step 3: Cross multiply
   16,216.33x = 22,379.58 × 9,143.21
4. Step 4: Simplify right side
   16,216.33x = 204,621,087.75
5. Step 5: Solve for x
   x = 204,621,087.75/16,216.33
6. Step 6: Final answer
   x = 12,618.21