Finding the Fourth Proportional to 2,086.56, 2,878.44 and 1,289.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.56 : 2,878.44 = 1,289.22 : x
2. Step 2: Convert to fraction form
   2,086.56/2,878.44 = 1,289.22/x
3. Step 3: Cross multiply
   2,086.56x = 2,878.44 × 1,289.22
4. Step 4: Simplify right side
   2,086.56x = 3,710,926.79
5. Step 5: Solve for x
   x = 3,710,926.79/2,086.56
6. Step 6: Final answer
   x = 1,778.49