Finding the Fourth Proportional to 13,185.68, 18,196.20 and 7,217.40

Step by Step Solution

1. Step 1: Write the proportion equation
   13,185.68 : 18,196.20 = 7,217.40 : x
2. Step 2: Convert to fraction form
   13,185.68/18,196.20 = 7,217.40/x
3. Step 3: Cross multiply
   13,185.68x = 18,196.20 × 7,217.40
4. Step 4: Simplify right side
   13,185.68x = 131,329,253.88
5. Step 5: Solve for x
   x = 131,329,253.88/13,185.68
6. Step 6: Final answer
   x = 9,959.99