Finding the Fourth Proportional to 13,196.42, 18,211.32 and 7,228.09

Step by Step Solution

1. Step 1: Write the proportion equation
   13,196.42 : 18,211.32 = 7,228.09 : x
2. Step 2: Convert to fraction form
   13,196.42/18,211.32 = 7,228.09/x
3. Step 3: Cross multiply
   13,196.42x = 18,211.32 × 7,228.09
4. Step 4: Simplify right side
   13,196.42x = 131,632,932.78
5. Step 5: Solve for x
   x = 131,632,932.78/13,196.42
6. Step 6: Final answer
   x = 9,974.90