Finding the Third Proportional to 142.88 and 304.88

Step by Step Solution

1. Step 1: Write the proportion equation
   142.88 : 304.88 = 304.88 : x
2. Step 2: Convert to fraction form
   142.88/304.88 = 304.88/x
3. Step 3: Cross multiply
   142.88x = 304.88 × 304.88
4. Step 4: Simplify right side
   142.88x = 92,948.77
5. Step 5: Solve for x
   x = 92,948.77/142.88
6. Step 6: Final answer
   x = 650.56