Finding the Fourth Proportional to 2,279.85, 3,145.94 and 1,285.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,279.85 : 3,145.94 = 1,285.17 : x
2. Step 2: Convert to fraction form
   2,279.85/3,145.94 = 1,285.17/x
3. Step 3: Cross multiply
   2,279.85x = 3,145.94 × 1,285.17
4. Step 4: Simplify right side
   2,279.85x = 4,043,054.31
5. Step 5: Solve for x
   x = 4,043,054.31/2,279.85
6. Step 6: Final answer
   x = 1,773.39