Finding the Fourth Proportional to 2,086.44, 2,877.98 and 1,289.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.44 : 2,877.98 = 1,289.55 : x
2. Step 2: Convert to fraction form
   2,086.44/2,877.98 = 1,289.55/x
3. Step 3: Cross multiply
   2,086.44x = 2,877.98 × 1,289.55
4. Step 4: Simplify right side
   2,086.44x = 3,711,292.66
5. Step 5: Solve for x
   x = 3,711,292.66/2,086.44
6. Step 6: Final answer
   x = 1,778.77