Finding the Fourth Proportional to 21,488.58, 29,654.28 and 12,057.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,488.58 : 29,654.28 = 12,057.12 : x
2. Step 2: Convert to fraction form
   21,488.58/29,654.28 = 12,057.12/x
3. Step 3: Cross multiply
   21,488.58x = 29,654.28 × 12,057.12
4. Step 4: Simplify right side
   21,488.58x = 357,545,212.47
5. Step 5: Solve for x
   x = 357,545,212.47/21,488.58
6. Step 6: Final answer
   x = 16,638.85