Finding the Fourth Proportional to 13,186.96, 19,739.16 and 7,324.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,186.96 : 19,739.16 = 7,324.72 : x
2. Step 2: Convert to fraction form
   13,186.96/19,739.16 = 7,324.72/x
3. Step 3: Cross multiply
   13,186.96x = 19,739.16 × 7,324.72
4. Step 4: Simplify right side
   13,186.96x = 144,583,820.04
5. Step 5: Solve for x
   x = 144,583,820.04/13,186.96
6. Step 6: Final answer
   x = 10,964.15