Finding the Fourth Proportional to 21,339.55, 29,443.86 and 12,381.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,339.55 : 29,443.86 = 12,381.86 : x
2. Step 2: Convert to fraction form
   21,339.55/29,443.86 = 12,381.86/x
3. Step 3: Cross multiply
   21,339.55x = 29,443.86 × 12,381.86
4. Step 4: Simplify right side
   21,339.55x = 364,569,752.38
5. Step 5: Solve for x
   x = 364,569,752.38/21,339.55
6. Step 6: Final answer
   x = 17,084.23