Finding the Fourth Proportional to 1,279.94, 1,766.25 and 756.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,279.94 : 1,766.25 = 756.30 : x
2. Step 2: Convert to fraction form
   1,279.94/1,766.25 = 756.30/x
3. Step 3: Cross multiply
   1,279.94x = 1,766.25 × 756.30
4. Step 4: Simplify right side
   1,279.94x = 1,335,814.88
5. Step 5: Solve for x
   x = 1,335,814.88/1,279.94
6. Step 6: Final answer
   x = 1,043.65