Finding the Fourth Proportional to 2,279.63, 3,145.89 and 1,231.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,279.63 : 3,145.89 = 1,231.69 : x
2. Step 2: Convert to fraction form
   2,279.63/3,145.89 = 1,231.69/x
3. Step 3: Cross multiply
   2,279.63x = 3,145.89 × 1,231.69
4. Step 4: Simplify right side
   2,279.63x = 3,874,758.35
5. Step 5: Solve for x
   x = 3,874,758.35/2,279.63
6. Step 6: Final answer
   x = 1,699.73