Finding the Fourth Proportional to 15,872.16, 21,902.16 and 8,796.72

Step by Step Solution

1. Step 1: Write the proportion equation
   15,872.16 : 21,902.16 = 8,796.72 : x
2. Step 2: Convert to fraction form
   15,872.16/21,902.16 = 8,796.72/x
3. Step 3: Cross multiply
   15,872.16x = 21,902.16 × 8,796.72
4. Step 4: Simplify right side
   15,872.16x = 192,667,168.92
5. Step 5: Solve for x
   x = 192,667,168.92/15,872.16
6. Step 6: Final answer
   x = 12,138.69