Finding the Fourth Proportional to 8,919.72, 13,375.17 and 5,222.88

Step by Step Solution

1. Step 1: Write the proportion equation
   8,919.72 : 13,375.17 = 5,222.88 : x
2. Step 2: Convert to fraction form
   8,919.72/13,375.17 = 5,222.88/x
3. Step 3: Cross multiply
   8,919.72x = 13,375.17 × 5,222.88
4. Step 4: Simplify right side
   8,919.72x = 69,856,907.89
5. Step 5: Solve for x
   x = 69,856,907.89/8,919.72
6. Step 6: Final answer
   x = 7,831.74