Finding the Fourth Proportional to 2,080.09, 3,118.20 and 780.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.09 : 3,118.20 = 780.67 : x
2. Step 2: Convert to fraction form
   2,080.09/3,118.20 = 780.67/x
3. Step 3: Cross multiply
   2,080.09x = 3,118.20 × 780.67
4. Step 4: Simplify right side
   2,080.09x = 2,434,285.19
5. Step 5: Solve for x
   x = 2,434,285.19/2,080.09
6. Step 6: Final answer
   x = 1,170.28