Finding the Fourth Proportional to 2,279.32, 3,145.16 and 1,284.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,279.32 : 3,145.16 = 1,284.64 : x
2. Step 2: Convert to fraction form
   2,279.32/3,145.16 = 1,284.64/x
3. Step 3: Cross multiply
   2,279.32x = 3,145.16 × 1,284.64
4. Step 4: Simplify right side
   2,279.32x = 4,040,398.34
5. Step 5: Solve for x
   x = 4,040,398.34/2,279.32
6. Step 6: Final answer
   x = 1,772.63