Finding the Fourth Proportional to 21,499, 29,668.83 and 12,067.77

Step by Step Solution

1. Step 1: Write the proportion equation
   21,499 : 29,668.83 = 12,067.77 : x
2. Step 2: Convert to fraction form
   21,499/29,668.83 = 12,067.77/x
3. Step 3: Cross multiply
   21,499x = 29,668.83 × 12,067.77
4. Step 4: Simplify right side
   21,499x = 358,036,616.61
5. Step 5: Solve for x
   x = 358,036,616.61/21,499
6. Step 6: Final answer
   x = 16,653.64