Finding the Fourth Proportional to 12,259.74, 18,390.27 and 3,939.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,259.74 : 18,390.27 = 3,939.12 : x
2. Step 2: Convert to fraction form
   12,259.74/18,390.27 = 3,939.12/x
3. Step 3: Cross multiply
   12,259.74x = 18,390.27 × 3,939.12
4. Step 4: Simplify right side
   12,259.74x = 72,441,480.36
5. Step 5: Solve for x
   x = 72,441,480.36/12,259.74
6. Step 6: Final answer
   x = 5,908.89