Finding the Third Proportional to 772 and 1,104.50

Step by Step Solution

1. Step 1: Write the proportion equation
   772 : 1,104.50 = 1,104.50 : x
2. Step 2: Convert to fraction form
   772/1,104.50 = 1,104.50/x
3. Step 3: Cross multiply
   772x = 1,104.50 × 1,104.50
4. Step 4: Simplify right side
   772x = 1,219,920.25
5. Step 5: Solve for x
   x = 1,219,920.25/772
6. Step 6: Final answer
   x = 1,580.21