Finding the Third Proportional to 238.69 and 554.81

Step by Step Solution

1. Step 1: Write the proportion equation
   238.69 : 554.81 = 554.81 : x
2. Step 2: Convert to fraction form
   238.69/554.81 = 554.81/x
3. Step 3: Cross multiply
   238.69x = 554.81 × 554.81
4. Step 4: Simplify right side
   238.69x = 307,816.91
5. Step 5: Solve for x
   x = 307,816.91/238.69
6. Step 6: Final answer
   x = 1,289.62