Finding the Fourth Proportional to 2,065.42, 2,850.78 and 1,279

Step by Step Solution

1. Step 1: Write the proportion equation
   2,065.42 : 2,850.78 = 1,279 : x
2. Step 2: Convert to fraction form
   2,065.42/2,850.78 = 1,279/x
3. Step 3: Cross multiply
   2,065.42x = 2,850.78 × 1,279
4. Step 4: Simplify right side
   2,065.42x = 3,646,147.62
5. Step 5: Solve for x
   x = 3,646,147.62/2,065.42
6. Step 6: Final answer
   x = 1,765.33