Finding the Fourth Proportional to 12,399.12, 18,598.71 and 3,039.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,399.12 : 18,598.71 = 3,039.18 : x
2. Step 2: Convert to fraction form
   12,399.12/18,598.71 = 3,039.18/x
3. Step 3: Cross multiply
   12,399.12x = 18,598.71 × 3,039.18
4. Step 4: Simplify right side
   12,399.12x = 56,524,827.46
5. Step 5: Solve for x
   x = 56,524,827.46/12,399.12
6. Step 6: Final answer
   x = 4,558.78