Finding the Fourth Proportional to 2,399.60, 3,601.08 and 920.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.60 : 3,601.08 = 920.24 : x
2. Step 2: Convert to fraction form
   2,399.60/3,601.08 = 920.24/x
3. Step 3: Cross multiply
   2,399.60x = 3,601.08 × 920.24
4. Step 4: Simplify right side
   2,399.60x = 3,313,857.86
5. Step 5: Solve for x
   x = 3,313,857.86/2,399.60
6. Step 6: Final answer
   x = 1,381.00