Finding the Fourth Proportional to 2,479.31, 3,720.45 and 919.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,479.31 : 3,720.45 = 919.05 : x
2. Step 2: Convert to fraction form
   2,479.31/3,720.45 = 919.05/x
3. Step 3: Cross multiply
   2,479.31x = 3,720.45 × 919.05
4. Step 4: Simplify right side
   2,479.31x = 3,419,279.57
5. Step 5: Solve for x
   x = 3,419,279.57/2,479.31
6. Step 6: Final answer
   x = 1,379.13