Finding the Fourth Proportional to 16,161.24, 22,302.78 and 8,991.72

Step by Step Solution

1. Step 1: Write the proportion equation
   16,161.24 : 22,302.78 = 8,991.72 : x
2. Step 2: Convert to fraction form
   16,161.24/22,302.78 = 8,991.72/x
3. Step 3: Cross multiply
   16,161.24x = 22,302.78 × 8,991.72
4. Step 4: Simplify right side
   16,161.24x = 200,540,352.98
5. Step 5: Solve for x
   x = 200,540,352.98/16,161.24
6. Step 6: Final answer
   x = 12,408.72