Finding the Fourth Proportional to 21,499.32, 29,669.04 and 12,067.90

Step by Step Solution

1. Step 1: Write the proportion equation
   21,499.32 : 29,669.04 = 12,067.90 : x
2. Step 2: Convert to fraction form
   21,499.32/29,669.04 = 12,067.90/x
3. Step 3: Cross multiply
   21,499.32x = 29,669.04 × 12,067.90
4. Step 4: Simplify right side
   21,499.32x = 358,043,007.82
5. Step 5: Solve for x
   x = 358,043,007.82/21,499.32
6. Step 6: Final answer
   x = 16,653.69