Finding the Fourth Proportional to 2,080.90, 3,118.15 and 1,805.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.90 : 3,118.15 = 1,805.70 : x
2. Step 2: Convert to fraction form
   2,080.90/3,118.15 = 1,805.70/x
3. Step 3: Cross multiply
   2,080.90x = 3,118.15 × 1,805.70
4. Step 4: Simplify right side
   2,080.90x = 5,630,443.46
5. Step 5: Solve for x
   x = 5,630,443.46/2,080.90
6. Step 6: Final answer
   x = 2,705.77