Finding the Fourth Proportional to 2,080.80, 3,119.90 and 693.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.80 : 3,119.90 = 693.78 : x
2. Step 2: Convert to fraction form
   2,080.80/3,119.90 = 693.78/x
3. Step 3: Cross multiply
   2,080.80x = 3,119.90 × 693.78
4. Step 4: Simplify right side
   2,080.80x = 2,164,520.75
5. Step 5: Solve for x
   x = 2,164,520.75/2,080.80
6. Step 6: Final answer
   x = 1,040.23