Finding the Fourth Proportional to 2,279.82, 3,145.90 and 1,285.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,279.82 : 3,145.90 = 1,285.02 : x
2. Step 2: Convert to fraction form
   2,279.82/3,145.90 = 1,285.02/x
3. Step 3: Cross multiply
   2,279.82x = 3,145.90 × 1,285.02
4. Step 4: Simplify right side
   2,279.82x = 4,042,544.42
5. Step 5: Solve for x
   x = 4,042,544.42/2,279.82
6. Step 6: Final answer
   x = 1,773.19