Finding the Third Proportional to 680.91 and 1,485.56

Step by Step Solution

1. Step 1: Write the proportion equation
   680.91 : 1,485.56 = 1,485.56 : x
2. Step 2: Convert to fraction form
   680.91/1,485.56 = 1,485.56/x
3. Step 3: Cross multiply
   680.91x = 1,485.56 × 1,485.56
4. Step 4: Simplify right side
   680.91x = 2,206,895.94
5. Step 5: Solve for x
   x = 2,206,895.94/680.91
6. Step 6: Final answer
   x = 3,241.12