Finding the Fourth Proportional to 12,378.24, 17,087.76 and 8,399.52

Step by Step Solution

1. Step 1: Write the proportion equation
   12,378.24 : 17,087.76 = 8,399.52 : x
2. Step 2: Convert to fraction form
   12,378.24/17,087.76 = 8,399.52/x
3. Step 3: Cross multiply
   12,378.24x = 17,087.76 × 8,399.52
4. Step 4: Simplify right side
   12,378.24x = 143,528,981.88
5. Step 5: Solve for x
   x = 143,528,981.88/12,378.24
6. Step 6: Final answer
   x = 11,595.27