Finding the Fourth Proportional to 22,606.16, 31,198.20 and 13,172.72

Step by Step Solution

1. Step 1: Write the proportion equation
   22,606.16 : 31,198.20 = 13,172.72 : x
2. Step 2: Convert to fraction form
   22,606.16/31,198.20 = 13,172.72/x
3. Step 3: Cross multiply
   22,606.16x = 31,198.20 × 13,172.72
4. Step 4: Simplify right side
   22,606.16x = 410,965,153.10
5. Step 5: Solve for x
   x = 410,965,153.10/22,606.16
6. Step 6: Final answer
   x = 18,179.34