Finding the Fourth Proportional to 2,279.55, 3,145.80 and 1,284.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,279.55 : 3,145.80 = 1,284.74 : x
2. Step 2: Convert to fraction form
   2,279.55/3,145.80 = 1,284.74/x
3. Step 3: Cross multiply
   2,279.55x = 3,145.80 × 1,284.74
4. Step 4: Simplify right side
   2,279.55x = 4,041,535.09
5. Step 5: Solve for x
   x = 4,041,535.09/2,279.55
6. Step 6: Final answer
   x = 1,772.95