Finding the Fourth Proportional to 13,636.96, 18,818.89 and 7,668.61

Step by Step Solution

1. Step 1: Write the proportion equation
   13,636.96 : 18,818.89 = 7,668.61 : x
2. Step 2: Convert to fraction form
   13,636.96/18,818.89 = 7,668.61/x
3. Step 3: Cross multiply
   13,636.96x = 18,818.89 × 7,668.61
4. Step 4: Simplify right side
   13,636.96x = 144,314,728.04
5. Step 5: Solve for x
   x = 144,314,728.04/13,636.96
6. Step 6: Final answer
   x = 10,582.62