Finding the Fourth Proportional to 12,309.93, 18,466.17 and 3,989.61

Step by Step Solution

1. Step 1: Write the proportion equation
   12,309.93 : 18,466.17 = 3,989.61 : x
2. Step 2: Convert to fraction form
   12,309.93/18,466.17 = 3,989.61/x
3. Step 3: Cross multiply
   12,309.93x = 18,466.17 × 3,989.61
4. Step 4: Simplify right side
   12,309.93x = 73,672,816.49
5. Step 5: Solve for x
   x = 73,672,816.49/12,309.93
6. Step 6: Final answer
   x = 5,984.83