Finding the Fourth Proportional to 21,786.12, 30,064.85 and 12,354.69

Step by Step Solution

1. Step 1: Write the proportion equation
   21,786.12 : 30,064.85 = 12,354.69 : x
2. Step 2: Convert to fraction form
   21,786.12/30,064.85 = 12,354.69/x
3. Step 3: Cross multiply
   21,786.12x = 30,064.85 × 12,354.69
4. Step 4: Simplify right side
   21,786.12x = 371,441,689.55
5. Step 5: Solve for x
   x = 371,441,689.55/21,786.12
6. Step 6: Final answer
   x = 17,049.46