Finding the Fourth Proportional to 22,215.72, 30,658.88 and 12,785.72

Step by Step Solution

1. Step 1: Write the proportion equation
   22,215.72 : 30,658.88 = 12,785.72 : x
2. Step 2: Convert to fraction form
   22,215.72/30,658.88 = 12,785.72/x
3. Step 3: Cross multiply
   22,215.72x = 30,658.88 × 12,785.72
4. Step 4: Simplify right side
   22,215.72x = 391,995,855.19
5. Step 5: Solve for x
   x = 391,995,855.19/22,215.72
6. Step 6: Final answer
   x = 17,644.98