Finding the Fourth Proportional to 8,318.42, 12,441.16 and 7,239.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,318.42 : 12,441.16 = 7,239.50 : x
2. Step 2: Convert to fraction form
   8,318.42/12,441.16 = 7,239.50/x
3. Step 3: Cross multiply
   8,318.42x = 12,441.16 × 7,239.50
4. Step 4: Simplify right side
   8,318.42x = 90,067,777.82
5. Step 5: Solve for x
   x = 90,067,777.82/8,318.42
6. Step 6: Final answer
   x = 10,827.51