Finding the Third Proportional to 711 and 1,086.75

Step by Step Solution

1. Step 1: Write the proportion equation
   711 : 1,086.75 = 1,086.75 : x
2. Step 2: Convert to fraction form
   711/1,086.75 = 1,086.75/x
3. Step 3: Cross multiply
   711x = 1,086.75 × 1,086.75
4. Step 4: Simplify right side
   711x = 1,181,025.56
5. Step 5: Solve for x
   x = 1,181,025.56/711
6. Step 6: Final answer
   x = 1,661.08