Finding the Fourth Proportional to 21,339.06, 29,443.16 and 12,381.36

Step by Step Solution

1. Step 1: Write the proportion equation
   21,339.06 : 29,443.16 = 12,381.36 : x
2. Step 2: Convert to fraction form
   21,339.06/29,443.16 = 12,381.36/x
3. Step 3: Cross multiply
   21,339.06x = 29,443.16 × 12,381.36
4. Step 4: Simplify right side
   21,339.06x = 364,546,363.50
5. Step 5: Solve for x
   x = 364,546,363.50/21,339.06
6. Step 6: Final answer
   x = 17,083.52