Finding the Third Proportional to 139.03 and 298.47

Step by Step Solution

1. Step 1: Write the proportion equation
   139.03 : 298.47 = 298.47 : x
2. Step 2: Convert to fraction form
   139.03/298.47 = 298.47/x
3. Step 3: Cross multiply
   139.03x = 298.47 × 298.47
4. Step 4: Simplify right side
   139.03x = 89,084.32
5. Step 5: Solve for x
   x = 89,084.32/139.03
6. Step 6: Final answer
   x = 640.75