Finding the Fourth Proportional to 21,668.76, 29,904.72 and 12,239.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,668.76 : 29,904.72 = 12,239.04 : x
2. Step 2: Convert to fraction form
   21,668.76/29,904.72 = 12,239.04/x
3. Step 3: Cross multiply
   21,668.76x = 29,904.72 × 12,239.04
4. Step 4: Simplify right side
   21,668.76x = 366,005,064.27
5. Step 5: Solve for x
   x = 366,005,064.27/21,668.76
6. Step 6: Final answer
   x = 16,890.91