Finding the Fourth Proportional to 2,080.37, 3,121.91 and 1,107.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.37 : 3,121.91 = 1,107.15 : x
2. Step 2: Convert to fraction form
   2,080.37/3,121.91 = 1,107.15/x
3. Step 3: Cross multiply
   2,080.37x = 3,121.91 × 1,107.15
4. Step 4: Simplify right side
   2,080.37x = 3,456,417.12
5. Step 5: Solve for x
   x = 3,456,417.12/2,080.37
6. Step 6: Final answer
   x = 1,661.45