Finding the Fourth Proportional to 21,339.05, 29,443.17 and 12,381.36

Step by Step Solution

1. Step 1: Write the proportion equation
   21,339.05 : 29,443.17 = 12,381.36 : x
2. Step 2: Convert to fraction form
   21,339.05/29,443.17 = 12,381.36/x
3. Step 3: Cross multiply
   21,339.05x = 29,443.17 × 12,381.36
4. Step 4: Simplify right side
   21,339.05x = 364,546,487.31
5. Step 5: Solve for x
   x = 364,546,487.31/21,339.05
6. Step 6: Final answer
   x = 17,083.54