Finding the Fourth Proportional to 21,604.86, 29,815.83 and 12,174.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,604.86 : 29,815.83 = 12,174.30 : x
2. Step 2: Convert to fraction form
   21,604.86/29,815.83 = 12,174.30/x
3. Step 3: Cross multiply
   21,604.86x = 29,815.83 × 12,174.30
4. Step 4: Simplify right side
   21,604.86x = 362,986,859.17
5. Step 5: Solve for x
   x = 362,986,859.17/21,604.86
6. Step 6: Final answer
   x = 16,801.17