Finding the Fourth Proportional to 21,498.57, 29,668.17 and 12,423.21

Step by Step Solution

1. Step 1: Write the proportion equation
   21,498.57 : 29,668.17 = 12,423.21 : x
2. Step 2: Convert to fraction form
   21,498.57/29,668.17 = 12,423.21/x
3. Step 3: Cross multiply
   21,498.57x = 29,668.17 × 12,423.21
4. Step 4: Simplify right side
   21,498.57x = 368,573,906.23
5. Step 5: Solve for x
   x = 368,573,906.23/21,498.57
6. Step 6: Final answer
   x = 17,144.11