Finding the Third Proportional to 670.50 and 1,200

Step by Step Solution

1. Step 1: Write the proportion equation
   670.50 : 1,200 = 1,200 : x
2. Step 2: Convert to fraction form
   670.50/1,200 = 1,200/x
3. Step 3: Cross multiply
   670.50x = 1,200 × 1,200
4. Step 4: Simplify right side
   670.50x = 1,440,000
5. Step 5: Solve for x
   x = 1,440,000/670.50
6. Step 6: Final answer
   x = 2,147.65