Finding the Fourth Proportional to 2,080.62, 3,119.31 and 781.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.62 : 3,119.31 = 781.38 : x
2. Step 2: Convert to fraction form
   2,080.62/3,119.31 = 781.38/x
3. Step 3: Cross multiply
   2,080.62x = 3,119.31 × 781.38
4. Step 4: Simplify right side
   2,080.62x = 2,437,366.45
5. Step 5: Solve for x
   x = 2,437,366.45/2,080.62
6. Step 6: Final answer
   x = 1,171.46