Finding the Fourth Proportional to 2,086.58, 2,876.49 and 1,289.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.58 : 2,876.49 = 1,289.37 : x
2. Step 2: Convert to fraction form
   2,086.58/2,876.49 = 1,289.37/x
3. Step 3: Cross multiply
   2,086.58x = 2,876.49 × 1,289.37
4. Step 4: Simplify right side
   2,086.58x = 3,708,859.91
5. Step 5: Solve for x
   x = 3,708,859.91/2,086.58
6. Step 6: Final answer
   x = 1,777.48