Finding the Third Proportional to 661.50 and 1,440

Step by Step Solution

1. Step 1: Write the proportion equation
   661.50 : 1,440 = 1,440 : x
2. Step 2: Convert to fraction form
   661.50/1,440 = 1,440/x
3. Step 3: Cross multiply
   661.50x = 1,440 × 1,440
4. Step 4: Simplify right side
   661.50x = 2,073,600
5. Step 5: Solve for x
   x = 2,073,600/661.50
6. Step 6: Final answer
   x = 3,134.69