Finding the Fourth Proportional to 21,443.04, 29,581.92 and 12,942.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,443.04 : 29,581.92 = 12,942.72 : x
2. Step 2: Convert to fraction form
   21,443.04/29,581.92 = 12,942.72/x
3. Step 3: Cross multiply
   21,443.04x = 29,581.92 × 12,942.72
4. Step 4: Simplify right side
   21,443.04x = 382,870,507.62
5. Step 5: Solve for x
   x = 382,870,507.62/21,443.04
6. Step 6: Final answer
   x = 17,855.23