Finding the Fourth Proportional to 21,381.30, 29,443.41 and 14,660.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,381.30 : 29,443.41 = 14,660.10 : x
2. Step 2: Convert to fraction form
   21,381.30/29,443.41 = 14,660.10/x
3. Step 3: Cross multiply
   21,381.30x = 29,443.41 × 14,660.10
4. Step 4: Simplify right side
   21,381.30x = 431,643,334.94
5. Step 5: Solve for x
   x = 431,643,334.94/21,381.30
6. Step 6: Final answer
   x = 20,187.89