Finding the Fourth Proportional to 2,759.42, 4,139.82 and 811.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,759.42 : 4,139.82 = 811.62 : x
2. Step 2: Convert to fraction form
   2,759.42/4,139.82 = 811.62/x
3. Step 3: Cross multiply
   2,759.42x = 4,139.82 × 811.62
4. Step 4: Simplify right side
   2,759.42x = 3,359,960.71
5. Step 5: Solve for x
   x = 3,359,960.71/2,759.42
6. Step 6: Final answer
   x = 1,217.63