Finding the Fourth Proportional to 21,038.69, 29,031.27 and 12,423.53

Step by Step Solution

1. Step 1: Write the proportion equation
   21,038.69 : 29,031.27 = 12,423.53 : x
2. Step 2: Convert to fraction form
   21,038.69/29,031.27 = 12,423.53/x
3. Step 3: Cross multiply
   21,038.69x = 29,031.27 × 12,423.53
4. Step 4: Simplify right side
   21,038.69x = 360,670,853.78
5. Step 5: Solve for x
   x = 360,670,853.78/21,038.69
6. Step 6: Final answer
   x = 17,143.22