Finding the Fourth Proportional to 13,186.50, 18,196.50 and 7,218.24

Step by Step Solution

1. Step 1: Write the proportion equation
   13,186.50 : 18,196.50 = 7,218.24 : x
2. Step 2: Convert to fraction form
   13,186.50/18,196.50 = 7,218.24/x
3. Step 3: Cross multiply
   13,186.50x = 18,196.50 × 7,218.24
4. Step 4: Simplify right side
   13,186.50x = 131,346,704.16
5. Step 5: Solve for x
   x = 131,346,704.16/13,186.50
6. Step 6: Final answer
   x = 9,960.69