Finding the Fourth Proportional to 21,488.46, 29,653.94 and 12,057

Step by Step Solution

1. Step 1: Write the proportion equation
   21,488.46 : 29,653.94 = 12,057 : x
2. Step 2: Convert to fraction form
   21,488.46/29,653.94 = 12,057/x
3. Step 3: Cross multiply
   21,488.46x = 29,653.94 × 12,057
4. Step 4: Simplify right side
   21,488.46x = 357,537,554.58
5. Step 5: Solve for x
   x = 357,537,554.58/21,488.46
6. Step 6: Final answer
   x = 16,638.58