Finding the Fourth Proportional to 2,279.72, 3,146.02 and 1,231.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,279.72 : 3,146.02 = 1,231.79 : x
2. Step 2: Convert to fraction form
   2,279.72/3,146.02 = 1,231.79/x
3. Step 3: Cross multiply
   2,279.72x = 3,146.02 × 1,231.79
4. Step 4: Simplify right side
   2,279.72x = 3,875,217.17
5. Step 5: Solve for x
   x = 3,875,217.17/2,279.72
6. Step 6: Final answer
   x = 1,699.87