Finding the Fourth Proportional to 2,078.85, 3,109.16 and 1,809.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.85 : 3,109.16 = 1,809.12 : x
2. Step 2: Convert to fraction form
   2,078.85/3,109.16 = 1,809.12/x
3. Step 3: Cross multiply
   2,078.85x = 3,109.16 × 1,809.12
4. Step 4: Simplify right side
   2,078.85x = 5,624,843.54
5. Step 5: Solve for x
   x = 5,624,843.54/2,078.85
6. Step 6: Final answer
   x = 2,705.75