Finding the Fourth Proportional to 2,080.42, 3,121.04 and 1,105.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.42 : 3,121.04 = 1,105.99 : x
2. Step 2: Convert to fraction form
   2,080.42/3,121.04 = 1,105.99/x
3. Step 3: Cross multiply
   2,080.42x = 3,121.04 × 1,105.99
4. Step 4: Simplify right side
   2,080.42x = 3,451,839.03
5. Step 5: Solve for x
   x = 3,451,839.03/2,080.42
6. Step 6: Final answer
   x = 1,659.20