Finding the Fourth Proportional to 2,480.15, 3,719.81 and 919.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,480.15 : 3,719.81 = 919.79 : x
2. Step 2: Convert to fraction form
   2,480.15/3,719.81 = 919.79/x
3. Step 3: Cross multiply
   2,480.15x = 3,719.81 × 919.79
4. Step 4: Simplify right side
   2,480.15x = 3,421,436.52
5. Step 5: Solve for x
   x = 3,421,436.52/2,480.15
6. Step 6: Final answer
   x = 1,379.53