Finding the Fourth Proportional to 13,196.86, 18,211.40 and 7,228.24

Step by Step Solution

1. Step 1: Write the proportion equation
   13,196.86 : 18,211.40 = 7,228.24 : x
2. Step 2: Convert to fraction form
   13,196.86/18,211.40 = 7,228.24/x
3. Step 3: Cross multiply
   13,196.86x = 18,211.40 × 7,228.24
4. Step 4: Simplify right side
   13,196.86x = 131,636,369.94
5. Step 5: Solve for x
   x = 131,636,369.94/13,196.86
6. Step 6: Final answer
   x = 9,974.83