Finding the Fourth Proportional to 2,759.82, 4,139.22 and 811.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,759.82 : 4,139.22 = 811.53 : x
2. Step 2: Convert to fraction form
   2,759.82/4,139.22 = 811.53/x
3. Step 3: Cross multiply
   2,759.82x = 4,139.22 × 811.53
4. Step 4: Simplify right side
   2,759.82x = 3,359,101.21
5. Step 5: Solve for x
   x = 3,359,101.21/2,759.82
6. Step 6: Final answer
   x = 1,217.15