Finding the Fourth Proportional to 13,185.78, 18,196.41 and 7,217.49

Step by Step Solution

1. Step 1: Write the proportion equation
   13,185.78 : 18,196.41 = 7,217.49 : x
2. Step 2: Convert to fraction form
   13,185.78/18,196.41 = 7,217.49/x
3. Step 3: Cross multiply
   13,185.78x = 18,196.41 × 7,217.49
4. Step 4: Simplify right side
   13,185.78x = 131,332,407.21
5. Step 5: Solve for x
   x = 131,332,407.21/13,185.78
6. Step 6: Final answer
   x = 9,960.15