Finding the Third Proportional to 139.25 and 304.75

Step by Step Solution

1. Step 1: Write the proportion equation
   139.25 : 304.75 = 304.75 : x
2. Step 2: Convert to fraction form
   139.25/304.75 = 304.75/x
3. Step 3: Cross multiply
   139.25x = 304.75 × 304.75
4. Step 4: Simplify right side
   139.25x = 92,872.56
5. Step 5: Solve for x
   x = 92,872.56/139.25
6. Step 6: Final answer
   x = 666.95