Finding the Fourth Proportional to 13,185.69, 18,196.28 and 7,217.74

Step by Step Solution

1. Step 1: Write the proportion equation
   13,185.69 : 18,196.28 = 7,217.74 : x
2. Step 2: Convert to fraction form
   13,185.69/18,196.28 = 7,217.74/x
3. Step 3: Cross multiply
   13,185.69x = 18,196.28 × 7,217.74
4. Step 4: Simplify right side
   13,185.69x = 131,336,031.73
5. Step 5: Solve for x
   x = 131,336,031.73/13,185.69
6. Step 6: Final answer
   x = 9,960.49