Finding the Fourth Proportional to 12,315.49, 18,469.31 and 3,993.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,315.49 : 18,469.31 = 3,993.55 : x
2. Step 2: Convert to fraction form
   12,315.49/18,469.31 = 3,993.55/x
3. Step 3: Cross multiply
   12,315.49x = 18,469.31 × 3,993.55
4. Step 4: Simplify right side
   12,315.49x = 73,758,112.95
5. Step 5: Solve for x
   x = 73,758,112.95/12,315.49
6. Step 6: Final answer
   x = 5,989.05