Finding the Fourth Proportional to 2,722.60, 4,080.79 and 1,078.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,722.60 : 4,080.79 = 1,078.30 : x
2. Step 2: Convert to fraction form
   2,722.60/4,080.79 = 1,078.30/x
3. Step 3: Cross multiply
   2,722.60x = 4,080.79 × 1,078.30
4. Step 4: Simplify right side
   2,722.60x = 4,400,315.86
5. Step 5: Solve for x
   x = 4,400,315.86/2,722.60
6. Step 6: Final answer
   x = 1,616.22