Finding the Fourth Proportional to 2,080.69, 3,121.34 and 782.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.69 : 3,121.34 = 782.46 : x
2. Step 2: Convert to fraction form
   2,080.69/3,121.34 = 782.46/x
3. Step 3: Cross multiply
   2,080.69x = 3,121.34 × 782.46
4. Step 4: Simplify right side
   2,080.69x = 2,442,319.78
5. Step 5: Solve for x
   x = 2,442,319.78/2,080.69
6. Step 6: Final answer
   x = 1,173.80