Finding the Fourth Proportional to 13,636.72, 18,816.49 and 7,668.04

Step by Step Solution

1. Step 1: Write the proportion equation
   13,636.72 : 18,816.49 = 7,668.04 : x
2. Step 2: Convert to fraction form
   13,636.72/18,816.49 = 7,668.04/x
3. Step 3: Cross multiply
   13,636.72x = 18,816.49 × 7,668.04
4. Step 4: Simplify right side
   13,636.72x = 144,285,494.61
5. Step 5: Solve for x
   x = 144,285,494.61/13,636.72
6. Step 6: Final answer
   x = 10,580.66