Finding the Fourth Proportional to 2,279.41, 3,145.58 and 1,231.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,279.41 : 3,145.58 = 1,231.47 : x
2. Step 2: Convert to fraction form
   2,279.41/3,145.58 = 1,231.47/x
3. Step 3: Cross multiply
   2,279.41x = 3,145.58 × 1,231.47
4. Step 4: Simplify right side
   2,279.41x = 3,873,690.48
5. Step 5: Solve for x
   x = 3,873,690.48/2,279.41
6. Step 6: Final answer
   x = 1,699.43