Finding the Fourth Proportional to 13,196.37, 18,211.20 and 7,228.61

Step by Step Solution

1. Step 1: Write the proportion equation
   13,196.37 : 18,211.20 = 7,228.61 : x
2. Step 2: Convert to fraction form
   13,196.37/18,211.20 = 7,228.61/x
3. Step 3: Cross multiply
   13,196.37x = 18,211.20 × 7,228.61
4. Step 4: Simplify right side
   13,196.37x = 131,641,571.38
5. Step 5: Solve for x
   x = 131,641,571.38/13,196.37
6. Step 6: Final answer
   x = 9,975.59