Finding the Fourth Proportional to 21,280.86, 29,367.90 and 12,329.01

Step by Step Solution

1. Step 1: Write the proportion equation
   21,280.86 : 29,367.90 = 12,329.01 : x
2. Step 2: Convert to fraction form
   21,280.86/29,367.90 = 12,329.01/x
3. Step 3: Cross multiply
   21,280.86x = 29,367.90 × 12,329.01
4. Step 4: Simplify right side
   21,280.86x = 362,077,132.78
5. Step 5: Solve for x
   x = 362,077,132.78/21,280.86
6. Step 6: Final answer
   x = 17,014.22