Finding the Fourth Proportional to 2,051.56, 3,078.62 and 818.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,051.56 : 3,078.62 = 818.78 : x
2. Step 2: Convert to fraction form
   2,051.56/3,078.62 = 818.78/x
3. Step 3: Cross multiply
   2,051.56x = 3,078.62 × 818.78
4. Step 4: Simplify right side
   2,051.56x = 2,520,708.39
5. Step 5: Solve for x
   x = 2,520,708.39/2,051.56
6. Step 6: Final answer
   x = 1,228.68