Finding the Fourth Proportional to 2,228.72, 3,075.26 and 1,284.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,228.72 : 3,075.26 = 1,284.40 : x
2. Step 2: Convert to fraction form
   2,228.72/3,075.26 = 1,284.40/x
3. Step 3: Cross multiply
   2,228.72x = 3,075.26 × 1,284.40
4. Step 4: Simplify right side
   2,228.72x = 3,949,849.83
5. Step 5: Solve for x
   x = 3,949,849.83/2,228.72
6. Step 6: Final answer
   x = 1,772.25