Finding the Fourth Proportional to 13,196.97, 18,211.76 and 7,228.69

Step by Step Solution

1. Step 1: Write the proportion equation
   13,196.97 : 18,211.76 = 7,228.69 : x
2. Step 2: Convert to fraction form
   13,196.97/18,211.76 = 7,228.69/x
3. Step 3: Cross multiply
   13,196.97x = 18,211.76 × 7,228.69
4. Step 4: Simplify right side
   13,196.97x = 131,647,167.39
5. Step 5: Solve for x
   x = 131,647,167.39/13,196.97
6. Step 6: Final answer
   x = 9,975.56