Finding the Fourth Proportional to 13,196.49, 18,211.17 and 7,228.54

Step by Step Solution

1. Step 1: Write the proportion equation
   13,196.49 : 18,211.17 = 7,228.54 : x
2. Step 2: Convert to fraction form
   13,196.49/18,211.17 = 7,228.54/x
3. Step 3: Cross multiply
   13,196.49x = 18,211.17 × 7,228.54
4. Step 4: Simplify right side
   13,196.49x = 131,640,170.79
5. Step 5: Solve for x
   x = 131,640,170.79/13,196.49
6. Step 6: Final answer
   x = 9,975.39