Finding the Fourth Proportional to 2,080.26, 3,119.46 and 780.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.26 : 3,119.46 = 780.81 : x
2. Step 2: Convert to fraction form
   2,080.26/3,119.46 = 780.81/x
3. Step 3: Cross multiply
   2,080.26x = 3,119.46 × 780.81
4. Step 4: Simplify right side
   2,080.26x = 2,435,705.56
5. Step 5: Solve for x
   x = 2,435,705.56/2,080.26
6. Step 6: Final answer
   x = 1,170.87