Finding the Fourth Proportional to 12,345.15, 17,025.57 and 8,574.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,345.15 : 17,025.57 = 8,574.60 : x
2. Step 2: Convert to fraction form
   12,345.15/17,025.57 = 8,574.60/x
3. Step 3: Cross multiply
   12,345.15x = 17,025.57 × 8,574.60
4. Step 4: Simplify right side
   12,345.15x = 145,987,452.52
5. Step 5: Solve for x
   x = 145,987,452.52/12,345.15
6. Step 6: Final answer
   x = 11,825.49