Finding the Fourth Proportional to 2,641.24, 3,960.06 and 1,080.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,641.24 : 3,960.06 = 1,080.78 : x
2. Step 2: Convert to fraction form
   2,641.24/3,960.06 = 1,080.78/x
3. Step 3: Cross multiply
   2,641.24x = 3,960.06 × 1,080.78
4. Step 4: Simplify right side
   2,641.24x = 4,279,934.74
5. Step 5: Solve for x
   x = 4,279,934.74/2,641.24
6. Step 6: Final answer
   x = 1,620.43