Finding the Third Proportional to 139.88 and 303.31

Step by Step Solution

1. Step 1: Write the proportion equation
   139.88 : 303.31 = 303.31 : x
2. Step 2: Convert to fraction form
   139.88/303.31 = 303.31/x
3. Step 3: Cross multiply
   139.88x = 303.31 × 303.31
4. Step 4: Simplify right side
   139.88x = 91,998.47
5. Step 5: Solve for x
   x = 91,998.47/139.88
6. Step 6: Final answer
   x = 657.72