Finding the Fourth Proportional to 21,321.09, 29,422.71 and 12,369.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,321.09 : 29,422.71 = 12,369.42 : x
2. Step 2: Convert to fraction form
   21,321.09/29,422.71 = 12,369.42/x
3. Step 3: Cross multiply
   21,321.09x = 29,422.71 × 12,369.42
4. Step 4: Simplify right side
   21,321.09x = 363,941,857.53
5. Step 5: Solve for x
   x = 363,941,857.53/21,321.09
6. Step 6: Final answer
   x = 17,069.57