Finding the Third Proportional to 1,217 and 1,818.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,217 : 1,818.50 = 1,818.50 : x
2. Step 2: Convert to fraction form
   1,217/1,818.50 = 1,818.50/x
3. Step 3: Cross multiply
   1,217x = 1,818.50 × 1,818.50
4. Step 4: Simplify right side
   1,217x = 3,306,942.25
5. Step 5: Solve for x
   x = 3,306,942.25/1,217
6. Step 6: Final answer
   x = 2,717.29