Finding the Third Proportional to 666.50 and 1,360

Step by Step Solution

1. Step 1: Write the proportion equation
   666.50 : 1,360 = 1,360 : x
2. Step 2: Convert to fraction form
   666.50/1,360 = 1,360/x
3. Step 3: Cross multiply
   666.50x = 1,360 × 1,360
4. Step 4: Simplify right side
   666.50x = 1,849,600
5. Step 5: Solve for x
   x = 1,849,600/666.50
6. Step 6: Final answer
   x = 2,775.09