Finding the Fourth Proportional to 12,499.49, 17,231.51 and 8,515.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,499.49 : 17,231.51 = 8,515.50 : x
2. Step 2: Convert to fraction form
   12,499.49/17,231.51 = 8,515.50/x
3. Step 3: Cross multiply
   12,499.49x = 17,231.51 × 8,515.50
4. Step 4: Simplify right side
   12,499.49x = 146,734,880.83
5. Step 5: Solve for x
   x = 146,734,880.83/12,499.49
6. Step 6: Final answer
   x = 11,739.27