Finding the Fourth Proportional to 9,367.72, 12,859.78 and 8,039.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,367.72 : 12,859.78 = 8,039.12 : x
2. Step 2: Convert to fraction form
   9,367.72/12,859.78 = 8,039.12/x
3. Step 3: Cross multiply
   9,367.72x = 12,859.78 × 8,039.12
4. Step 4: Simplify right side
   9,367.72x = 103,381,314.59
5. Step 5: Solve for x
   x = 103,381,314.59/9,367.72
6. Step 6: Final answer
   x = 11,035.91