Finding the Fourth Proportional to 2,789.55, 4,185.18 and 1,680.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,789.55 : 4,185.18 = 1,680.18 : x
2. Step 2: Convert to fraction form
   2,789.55/4,185.18 = 1,680.18/x
3. Step 3: Cross multiply
   2,789.55x = 4,185.18 × 1,680.18
4. Step 4: Simplify right side
   2,789.55x = 7,031,855.73
5. Step 5: Solve for x
   x = 7,031,855.73/2,789.55
6. Step 6: Final answer
   x = 2,520.78