Finding the Fourth Proportional to 1,280.09, 1,766.52 and 756.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,280.09 : 1,766.52 = 756.15 : x
2. Step 2: Convert to fraction form
   1,280.09/1,766.52 = 756.15/x
3. Step 3: Cross multiply
   1,280.09x = 1,766.52 × 756.15
4. Step 4: Simplify right side
   1,280.09x = 1,335,754.10
5. Step 5: Solve for x
   x = 1,335,754.10/1,280.09
6. Step 6: Final answer
   x = 1,043.48