Finding the Fourth Proportional to 13,196.97, 18,211.83 and 7,228.66

Step by Step Solution

1. Step 1: Write the proportion equation
   13,196.97 : 18,211.83 = 7,228.66 : x
2. Step 2: Convert to fraction form
   13,196.97/18,211.83 = 7,228.66/x
3. Step 3: Cross multiply
   13,196.97x = 18,211.83 × 7,228.66
4. Step 4: Simplify right side
   13,196.97x = 131,647,185.72
5. Step 5: Solve for x
   x = 131,647,185.72/13,196.97
6. Step 6: Final answer
   x = 9,975.56