Finding the Fourth Proportional to 2,399.55, 3,600.63 and 919.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.55 : 3,600.63 = 919.77 : x
2. Step 2: Convert to fraction form
   2,399.55/3,600.63 = 919.77/x
3. Step 3: Cross multiply
   2,399.55x = 3,600.63 × 919.77
4. Step 4: Simplify right side
   2,399.55x = 3,311,751.46
5. Step 5: Solve for x
   x = 3,311,751.46/2,399.55
6. Step 6: Final answer
   x = 1,380.16