Finding the Fourth Proportional to 1,280.32, 1,766.88 and 756.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,280.32 : 1,766.88 = 756.16 : x
2. Step 2: Convert to fraction form
   1,280.32/1,766.88 = 756.16/x
3. Step 3: Cross multiply
   1,280.32x = 1,766.88 × 756.16
4. Step 4: Simplify right side
   1,280.32x = 1,336,043.98
5. Step 5: Solve for x
   x = 1,336,043.98/1,280.32
6. Step 6: Final answer
   x = 1,043.52