Finding the Fourth Proportional to 16,212.72, 22,372.64 and 9,139.52

Step by Step Solution

1. Step 1: Write the proportion equation
   16,212.72 : 22,372.64 = 9,139.52 : x
2. Step 2: Convert to fraction form
   16,212.72/22,372.64 = 9,139.52/x
3. Step 3: Cross multiply
   16,212.72x = 22,372.64 × 9,139.52
4. Step 4: Simplify right side
   16,212.72x = 204,475,190.73
5. Step 5: Solve for x
   x = 204,475,190.73/16,212.72
6. Step 6: Final answer
   x = 12,612.02