Finding the Third Proportional to 139.03 and 321.52

Step by Step Solution

1. Step 1: Write the proportion equation
   139.03 : 321.52 = 321.52 : x
2. Step 2: Convert to fraction form
   139.03/321.52 = 321.52/x
3. Step 3: Cross multiply
   139.03x = 321.52 × 321.52
4. Step 4: Simplify right side
   139.03x = 103,372.30
5. Step 5: Solve for x
   x = 103,372.30/139.03
6. Step 6: Final answer
   x = 743.52