Finding the Fourth Proportional to 8,138.72, 12,208.06 and 7,039.82

Step by Step Solution

1. Step 1: Write the proportion equation
   8,138.72 : 12,208.06 = 7,039.82 : x
2. Step 2: Convert to fraction form
   8,138.72/12,208.06 = 7,039.82/x
3. Step 3: Cross multiply
   8,138.72x = 12,208.06 × 7,039.82
4. Step 4: Simplify right side
   8,138.72x = 85,942,544.95
5. Step 5: Solve for x
   x = 85,942,544.95/8,138.72
6. Step 6: Final answer
   x = 10,559.71