Finding the Fourth Proportional to 22,304.72, 30,779.40 and 12,872.72

Step by Step Solution

1. Step 1: Write the proportion equation
   22,304.72 : 30,779.40 = 12,872.72 : x
2. Step 2: Convert to fraction form
   22,304.72/30,779.40 = 12,872.72/x
3. Step 3: Cross multiply
   22,304.72x = 30,779.40 × 12,872.72
4. Step 4: Simplify right side
   22,304.72x = 396,214,597.97
5. Step 5: Solve for x
   x = 396,214,597.97/22,304.72
6. Step 6: Final answer
   x = 17,763.71