Finding the Fourth Proportional to 21,499.34, 29,671.89 and 12,067.91

Step by Step Solution

1. Step 1: Write the proportion equation
   21,499.34 : 29,671.89 = 12,067.91 : x
2. Step 2: Convert to fraction form
   21,499.34/29,671.89 = 12,067.91/x
3. Step 3: Cross multiply
   21,499.34x = 29,671.89 × 12,067.91
4. Step 4: Simplify right side
   21,499.34x = 358,077,698.05
5. Step 5: Solve for x
   x = 358,077,698.05/21,499.34
6. Step 6: Final answer
   x = 16,655.29