Finding the Fourth Proportional to 12,399.72, 18,598.14 and 3,165.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,399.72 : 18,598.14 = 3,165.48 : x
2. Step 2: Convert to fraction form
   12,399.72/18,598.14 = 3,165.48/x
3. Step 3: Cross multiply
   12,399.72x = 18,598.14 × 3,165.48
4. Step 4: Simplify right side
   12,399.72x = 58,872,040.21
5. Step 5: Solve for x
   x = 58,872,040.21/12,399.72
6. Step 6: Final answer
   x = 4,747.85