Finding the Third Proportional to 723.50 and 1,105.50

Step by Step Solution

1. Step 1: Write the proportion equation
   723.50 : 1,105.50 = 1,105.50 : x
2. Step 2: Convert to fraction form
   723.50/1,105.50 = 1,105.50/x
3. Step 3: Cross multiply
   723.50x = 1,105.50 × 1,105.50
4. Step 4: Simplify right side
   723.50x = 1,222,130.25
5. Step 5: Solve for x
   x = 1,222,130.25/723.50
6. Step 6: Final answer
   x = 1,689.19