Finding the Third Proportional to 238.78 and 451.69

Step by Step Solution

1. Step 1: Write the proportion equation
   238.78 : 451.69 = 451.69 : x
2. Step 2: Convert to fraction form
   238.78/451.69 = 451.69/x
3. Step 3: Cross multiply
   238.78x = 451.69 × 451.69
4. Step 4: Simplify right side
   238.78x = 204,021.60
5. Step 5: Solve for x
   x = 204,021.60/238.78
6. Step 6: Final answer
   x = 854.43