Finding the Fourth Proportional to 13,223.50, 18,249.15 and 7,636.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,223.50 : 18,249.15 = 7,636.30 : x
2. Step 2: Convert to fraction form
   13,223.50/18,249.15 = 7,636.30/x
3. Step 3: Cross multiply
   13,223.50x = 18,249.15 × 7,636.30
4. Step 4: Simplify right side
   13,223.50x = 139,355,984.15
5. Step 5: Solve for x
   x = 139,355,984.15/13,223.50
6. Step 6: Final answer
   x = 10,538.51