Finding the Fourth Proportional to 13,186.05, 18,196.56 and 7,217.58

Step by Step Solution

1. Step 1: Write the proportion equation
   13,186.05 : 18,196.56 = 7,217.58 : x
2. Step 2: Convert to fraction form
   13,186.05/18,196.56 = 7,217.58/x
3. Step 3: Cross multiply
   13,186.05x = 18,196.56 × 7,217.58
4. Step 4: Simplify right side
   13,186.05x = 131,335,127.52
5. Step 5: Solve for x
   x = 131,335,127.52/13,186.05
6. Step 6: Final answer
   x = 9,960.16