Finding the Fourth Proportional to 2,818.64, 4,229.78 and 1,259.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,818.64 : 4,229.78 = 1,259.60 : x
2. Step 2: Convert to fraction form
   2,818.64/4,229.78 = 1,259.60/x
3. Step 3: Cross multiply
   2,818.64x = 4,229.78 × 1,259.60
4. Step 4: Simplify right side
   2,818.64x = 5,327,830.89
5. Step 5: Solve for x
   x = 5,327,830.89/2,818.64
6. Step 6: Final answer
   x = 1,890.21