Finding the Fourth Proportional to 2,279.72, 3,145.86 and 1,284.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,279.72 : 3,145.86 = 1,284.86 : x
2. Step 2: Convert to fraction form
   2,279.72/3,145.86 = 1,284.86/x
3. Step 3: Cross multiply
   2,279.72x = 3,145.86 × 1,284.86
4. Step 4: Simplify right side
   2,279.72x = 4,042,001.16
5. Step 5: Solve for x
   x = 4,042,001.16/2,279.72
6. Step 6: Final answer
   x = 1,773.03