Finding the Third Proportional to 718 and 1,520.50

Step by Step Solution

1. Step 1: Write the proportion equation
   718 : 1,520.50 = 1,520.50 : x
2. Step 2: Convert to fraction form
   718/1,520.50 = 1,520.50/x
3. Step 3: Cross multiply
   718x = 1,520.50 × 1,520.50
4. Step 4: Simplify right side
   718x = 2,311,920.25
5. Step 5: Solve for x
   x = 2,311,920.25/718
6. Step 6: Final answer
   x = 3,219.94