Finding the Third Proportional to 809.50 and 1,155

Step by Step Solution

1. Step 1: Write the proportion equation
   809.50 : 1,155 = 1,155 : x
2. Step 2: Convert to fraction form
   809.50/1,155 = 1,155/x
3. Step 3: Cross multiply
   809.50x = 1,155 × 1,155
4. Step 4: Simplify right side
   809.50x = 1,334,025
5. Step 5: Solve for x
   x = 1,334,025/809.50
6. Step 6: Final answer
   x = 1,647.96