Finding the Fourth Proportional to 2,752.78, 4,129.59 and 805.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,752.78 : 4,129.59 = 805.15 : x
2. Step 2: Convert to fraction form
   2,752.78/4,129.59 = 805.15/x
3. Step 3: Cross multiply
   2,752.78x = 4,129.59 × 805.15
4. Step 4: Simplify right side
   2,752.78x = 3,324,939.39
5. Step 5: Solve for x
   x = 3,324,939.39/2,752.78
6. Step 6: Final answer
   x = 1,207.85