Finding the Fourth Proportional to 2,080.96, 3,121.38 and 782.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.96 : 3,121.38 = 782.56 : x
2. Step 2: Convert to fraction form
   2,080.96/3,121.38 = 782.56/x
3. Step 3: Cross multiply
   2,080.96x = 3,121.38 × 782.56
4. Step 4: Simplify right side
   2,080.96x = 2,442,667.13
5. Step 5: Solve for x
   x = 2,442,667.13/2,080.96
6. Step 6: Final answer
   x = 1,173.82