Finding the Fourth Proportional to 12,138.72, 18,191.04 and 9,662.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,138.72 : 18,191.04 = 9,662.56 : x
2. Step 2: Convert to fraction form
   12,138.72/18,191.04 = 9,662.56/x
3. Step 3: Cross multiply
   12,138.72x = 18,191.04 × 9,662.56
4. Step 4: Simplify right side
   12,138.72x = 175,772,015.46
5. Step 5: Solve for x
   x = 175,772,015.46/12,138.72
6. Step 6: Final answer
   x = 14,480.28