Finding the Fourth Proportional to 2,279.13, 3,145.32 and 1,284.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,279.13 : 3,145.32 = 1,284.45 : x
2. Step 2: Convert to fraction form
   2,279.13/3,145.32 = 1,284.45/x
3. Step 3: Cross multiply
   2,279.13x = 3,145.32 × 1,284.45
4. Step 4: Simplify right side
   2,279.13x = 4,040,006.27
5. Step 5: Solve for x
   x = 4,040,006.27/2,279.13
6. Step 6: Final answer
   x = 1,772.61