Finding the Third Proportional to 775.50 and 1,216.50

Step by Step Solution

1. Step 1: Write the proportion equation
   775.50 : 1,216.50 = 1,216.50 : x
2. Step 2: Convert to fraction form
   775.50/1,216.50 = 1,216.50/x
3. Step 3: Cross multiply
   775.50x = 1,216.50 × 1,216.50
4. Step 4: Simplify right side
   775.50x = 1,479,872.25
5. Step 5: Solve for x
   x = 1,479,872.25/775.50
6. Step 6: Final answer
   x = 1,908.28