Finding the Fourth Proportional to 2,728.56, 4,093.01 and 780.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,728.56 : 4,093.01 = 780.92 : x
2. Step 2: Convert to fraction form
   2,728.56/4,093.01 = 780.92/x
3. Step 3: Cross multiply
   2,728.56x = 4,093.01 × 780.92
4. Step 4: Simplify right side
   2,728.56x = 3,196,313.37
5. Step 5: Solve for x
   x = 3,196,313.37/2,728.56
6. Step 6: Final answer
   x = 1,171.43