Finding the Fourth Proportional to 2,279.10, 3,144.84 and 1,284.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,279.10 : 3,144.84 = 1,284.20 : x
2. Step 2: Convert to fraction form
   2,279.10/3,144.84 = 1,284.20/x
3. Step 3: Cross multiply
   2,279.10x = 3,144.84 × 1,284.20
4. Step 4: Simplify right side
   2,279.10x = 4,038,603.53
5. Step 5: Solve for x
   x = 4,038,603.53/2,279.10
6. Step 6: Final answer
   x = 1,772.02