Finding the Third Proportional to 684.47 and 1,085.25

Step by Step Solution

1. Step 1: Write the proportion equation
   684.47 : 1,085.25 = 1,085.25 : x
2. Step 2: Convert to fraction form
   684.47/1,085.25 = 1,085.25/x
3. Step 3: Cross multiply
   684.47x = 1,085.25 × 1,085.25
4. Step 4: Simplify right side
   684.47x = 1,177,767.56
5. Step 5: Solve for x
   x = 1,177,767.56/684.47
6. Step 6: Final answer
   x = 1,720.70