Finding the Fourth Proportional to 20,584.72, 30,882.56 and 8,906.16

Step by Step Solution

1. Step 1: Write the proportion equation
   20,584.72 : 30,882.56 = 8,906.16 : x
2. Step 2: Convert to fraction form
   20,584.72/30,882.56 = 8,906.16/x
3. Step 3: Cross multiply
   20,584.72x = 30,882.56 × 8,906.16
4. Step 4: Simplify right side
   20,584.72x = 275,045,020.57
5. Step 5: Solve for x
   x = 275,045,020.57/20,584.72
6. Step 6: Final answer
   x = 13,361.61