Finding the Fourth Proportional to 13,185.87, 18,196.52 and 7,217.91

Step by Step Solution

1. Step 1: Write the proportion equation
   13,185.87 : 18,196.52 = 7,217.91 : x
2. Step 2: Convert to fraction form
   13,185.87/18,196.52 = 7,217.91/x
3. Step 3: Cross multiply
   13,185.87x = 18,196.52 × 7,217.91
4. Step 4: Simplify right side
   13,185.87x = 131,340,807.58
5. Step 5: Solve for x
   x = 131,340,807.58/13,185.87
6. Step 6: Final answer
   x = 9,960.73