Finding the Fourth Proportional to 2,279.42, 3,145.62 and 1,284.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,279.42 : 3,145.62 = 1,284.69 : x
2. Step 2: Convert to fraction form
   2,279.42/3,145.62 = 1,284.69/x
3. Step 3: Cross multiply
   2,279.42x = 3,145.62 × 1,284.69
4. Step 4: Simplify right side
   2,279.42x = 4,041,146.56
5. Step 5: Solve for x
   x = 4,041,146.56/2,279.42
6. Step 6: Final answer
   x = 1,772.88