Finding the Fourth Proportional to 2,480.48, 3,719.76 and 920.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,480.48 : 3,719.76 = 920.24 : x
2. Step 2: Convert to fraction form
   2,480.48/3,719.76 = 920.24/x
3. Step 3: Cross multiply
   2,480.48x = 3,719.76 × 920.24
4. Step 4: Simplify right side
   2,480.48x = 3,423,071.94
5. Step 5: Solve for x
   x = 3,423,071.94/2,480.48
6. Step 6: Final answer
   x = 1,380.00