Finding the Fourth Proportional to 2,728.37, 4,091.86 and 879.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,728.37 : 4,091.86 = 879.68 : x
2. Step 2: Convert to fraction form
   2,728.37/4,091.86 = 879.68/x
3. Step 3: Cross multiply
   2,728.37x = 4,091.86 × 879.68
4. Step 4: Simplify right side
   2,728.37x = 3,599,527.40
5. Step 5: Solve for x
   x = 3,599,527.40/2,728.37
6. Step 6: Final answer
   x = 1,319.30