Finding the Fourth Proportional to 16,215.39, 22,377.87 and 9,142.07

Step by Step Solution

1. Step 1: Write the proportion equation
   16,215.39 : 22,377.87 = 9,142.07 : x
2. Step 2: Convert to fraction form
   16,215.39/22,377.87 = 9,142.07/x
3. Step 3: Cross multiply
   16,215.39x = 22,377.87 × 9,142.07
4. Step 4: Simplify right side
   16,215.39x = 204,579,942.10
5. Step 5: Solve for x
   x = 204,579,942.10/16,215.39
6. Step 6: Final answer
   x = 12,616.41