Finding the Fourth Proportional to 22,446.72, 30,976.60 and 13,020.88

Step by Step Solution

1. Step 1: Write the proportion equation
   22,446.72 : 30,976.60 = 13,020.88 : x
2. Step 2: Convert to fraction form
   22,446.72/30,976.60 = 13,020.88/x
3. Step 3: Cross multiply
   22,446.72x = 30,976.60 × 13,020.88
4. Step 4: Simplify right side
   22,446.72x = 403,342,591.41
5. Step 5: Solve for x
   x = 403,342,591.41/22,446.72
6. Step 6: Final answer
   x = 17,968.89