Finding the Third Proportional to 139.88 and 153.56

Step by Step Solution

1. Step 1: Write the proportion equation
   139.88 : 153.56 = 153.56 : x
2. Step 2: Convert to fraction form
   139.88/153.56 = 153.56/x
3. Step 3: Cross multiply
   139.88x = 153.56 × 153.56
4. Step 4: Simplify right side
   139.88x = 23,581.44
5. Step 5: Solve for x
   x = 23,581.44/139.88
6. Step 6: Final answer
   x = 168.59