Finding the Fourth Proportional to 2,640.52, 3,960.70 and 1,080.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.52 : 3,960.70 = 1,080.08 : x
2. Step 2: Convert to fraction form
   2,640.52/3,960.70 = 1,080.08/x
3. Step 3: Cross multiply
   2,640.52x = 3,960.70 × 1,080.08
4. Step 4: Simplify right side
   2,640.52x = 4,277,887.48
5. Step 5: Solve for x
   x = 4,277,887.48/2,640.52
6. Step 6: Final answer
   x = 1,620.09