Finding the Fourth Proportional to 12,240.96, 18,363.78 and 3,920.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,240.96 : 18,363.78 = 3,920.31 : x
2. Step 2: Convert to fraction form
   12,240.96/18,363.78 = 3,920.31/x
3. Step 3: Cross multiply
   12,240.96x = 18,363.78 × 3,920.31
4. Step 4: Simplify right side
   12,240.96x = 71,991,710.37
5. Step 5: Solve for x
   x = 71,991,710.37/12,240.96
6. Step 6: Final answer
   x = 5,881.21