Finding the Fourth Proportional to 8,857.72, 12,219.78 and 5,318.88

Step by Step Solution

1. Step 1: Write the proportion equation
   8,857.72 : 12,219.78 = 5,318.88 : x
2. Step 2: Convert to fraction form
   8,857.72/12,219.78 = 5,318.88/x
3. Step 3: Cross multiply
   8,857.72x = 12,219.78 × 5,318.88
4. Step 4: Simplify right side
   8,857.72x = 64,995,543.45
5. Step 5: Solve for x
   x = 64,995,543.45/8,857.72
6. Step 6: Final answer
   x = 7,337.73