Finding the Fourth Proportional to 22,248.72, 30,702.78 and 12,687.96

Step by Step Solution

1. Step 1: Write the proportion equation
   22,248.72 : 30,702.78 = 12,687.96 : x
2. Step 2: Convert to fraction form
   22,248.72/30,702.78 = 12,687.96/x
3. Step 3: Cross multiply
   22,248.72x = 30,702.78 × 12,687.96
4. Step 4: Simplify right side
   22,248.72x = 389,555,644.53
5. Step 5: Solve for x
   x = 389,555,644.53/22,248.72
6. Step 6: Final answer
   x = 17,509.13