Finding the Third Proportional to 911.50 and 1,218

Step by Step Solution

1. Step 1: Write the proportion equation
   911.50 : 1,218 = 1,218 : x
2. Step 2: Convert to fraction form
   911.50/1,218 = 1,218/x
3. Step 3: Cross multiply
   911.50x = 1,218 × 1,218
4. Step 4: Simplify right side
   911.50x = 1,483,524
5. Step 5: Solve for x
   x = 1,483,524/911.50
6. Step 6: Final answer
   x = 1,627.56