Finding the Fourth Proportional to 21,271.92, 29,361.72 and 12,321.63

Step by Step Solution

1. Step 1: Write the proportion equation
   21,271.92 : 29,361.72 = 12,321.63 : x
2. Step 2: Convert to fraction form
   21,271.92/29,361.72 = 12,321.63/x
3. Step 3: Cross multiply
   21,271.92x = 29,361.72 × 12,321.63
4. Step 4: Simplify right side
   21,271.92x = 361,784,250.00
5. Step 5: Solve for x
   x = 361,784,250.00/21,271.92
6. Step 6: Final answer
   x = 17,007.60