Finding the Fourth Proportional to 2,279.33, 3,145.56 and 1,284.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,279.33 : 3,145.56 = 1,284.65 : x
2. Step 2: Convert to fraction form
   2,279.33/3,145.56 = 1,284.65/x
3. Step 3: Cross multiply
   2,279.33x = 3,145.56 × 1,284.65
4. Step 4: Simplify right side
   2,279.33x = 4,040,943.65
5. Step 5: Solve for x
   x = 4,040,943.65/2,279.33
6. Step 6: Final answer
   x = 1,772.86