Finding the Fourth Proportional to 3,390.12, 5,081.94 and 1,080.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,390.12 : 5,081.94 = 1,080.12 : x
2. Step 2: Convert to fraction form
   3,390.12/5,081.94 = 1,080.12/x
3. Step 3: Cross multiply
   3,390.12x = 5,081.94 × 1,080.12
4. Step 4: Simplify right side
   3,390.12x = 5,489,105.03
5. Step 5: Solve for x
   x = 5,489,105.03/3,390.12
6. Step 6: Final answer
   x = 1,619.15