Finding the Fourth Proportional to 13,185.65, 18,196.22 and 7,217.69

Step by Step Solution

1. Step 1: Write the proportion equation
   13,185.65 : 18,196.22 = 7,217.69 : x
2. Step 2: Convert to fraction form
   13,185.65/18,196.22 = 7,217.69/x
3. Step 3: Cross multiply
   13,185.65x = 18,196.22 × 7,217.69
4. Step 4: Simplify right side
   13,185.65x = 131,334,718.65
5. Step 5: Solve for x
   x = 131,334,718.65/13,185.65
6. Step 6: Final answer
   x = 9,960.43