Finding the Fourth Proportional to 2,758.96, 4,139.28 and 811.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,758.96 : 4,139.28 = 811.18 : x
2. Step 2: Convert to fraction form
   2,758.96/4,139.28 = 811.18/x
3. Step 3: Cross multiply
   2,758.96x = 4,139.28 × 811.18
4. Step 4: Simplify right side
   2,758.96x = 3,357,701.15
5. Step 5: Solve for x
   x = 3,357,701.15/2,758.96
6. Step 6: Final answer
   x = 1,217.02