Finding the Third Proportional to 715.13 and 1,086.56

Step by Step Solution

1. Step 1: Write the proportion equation
   715.13 : 1,086.56 = 1,086.56 : x
2. Step 2: Convert to fraction form
   715.13/1,086.56 = 1,086.56/x
3. Step 3: Cross multiply
   715.13x = 1,086.56 × 1,086.56
4. Step 4: Simplify right side
   715.13x = 1,180,618.07
5. Step 5: Solve for x
   x = 1,180,618.07/715.13
6. Step 6: Final answer
   x = 1,650.93