Finding the Third Proportional to 685.27 and 1,485.98

Step by Step Solution

1. Step 1: Write the proportion equation
   685.27 : 1,485.98 = 1,485.98 : x
2. Step 2: Convert to fraction form
   685.27/1,485.98 = 1,485.98/x
3. Step 3: Cross multiply
   685.27x = 1,485.98 × 1,485.98
4. Step 4: Simplify right side
   685.27x = 2,208,149.56
5. Step 5: Solve for x
   x = 2,208,149.56/685.27
6. Step 6: Final answer
   x = 3,222.33