Finding the Third Proportional to 139.88 and 225.56

Step by Step Solution

1. Step 1: Write the proportion equation
   139.88 : 225.56 = 225.56 : x
2. Step 2: Convert to fraction form
   139.88/225.56 = 225.56/x
3. Step 3: Cross multiply
   139.88x = 225.56 × 225.56
4. Step 4: Simplify right side
   139.88x = 50,878.44
5. Step 5: Solve for x
   x = 50,878.44/139.88
6. Step 6: Final answer
   x = 363.74