Finding the Third Proportional to 664.69 and 1,435.59

Step by Step Solution

1. Step 1: Write the proportion equation
   664.69 : 1,435.59 = 1,435.59 : x
2. Step 2: Convert to fraction form
   664.69/1,435.59 = 1,435.59/x
3. Step 3: Cross multiply
   664.69x = 1,435.59 × 1,435.59
4. Step 4: Simplify right side
   664.69x = 2,060,929.42
5. Step 5: Solve for x
   x = 2,060,929.42/664.69
6. Step 6: Final answer
   x = 3,100.60