Finding the Fourth Proportional to 13,196.85, 18,211.89 and 7,228.41

Step by Step Solution

1. Step 1: Write the proportion equation
   13,196.85 : 18,211.89 = 7,228.41 : x
2. Step 2: Convert to fraction form
   13,196.85/18,211.89 = 7,228.41/x
3. Step 3: Cross multiply
   13,196.85x = 18,211.89 × 7,228.41
4. Step 4: Simplify right side
   13,196.85x = 131,643,007.79
5. Step 5: Solve for x
   x = 131,643,007.79/13,196.85
6. Step 6: Final answer
   x = 9,975.34