Finding the Fourth Proportional to 2,287.87, 3,156.85 and 1,279.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,287.87 : 3,156.85 = 1,279.59 : x
2. Step 2: Convert to fraction form
   2,287.87/3,156.85 = 1,279.59/x
3. Step 3: Cross multiply
   2,287.87x = 3,156.85 × 1,279.59
4. Step 4: Simplify right side
   2,287.87x = 4,039,482.89
5. Step 5: Solve for x
   x = 4,039,482.89/2,287.87
6. Step 6: Final answer
   x = 1,765.61