Finding the Third Proportional to 554.25 and 820.88

Step by Step Solution

1. Step 1: Write the proportion equation
   554.25 : 820.88 = 820.88 : x
2. Step 2: Convert to fraction form
   554.25/820.88 = 820.88/x
3. Step 3: Cross multiply
   554.25x = 820.88 × 820.88
4. Step 4: Simplify right side
   554.25x = 673,835.77
5. Step 5: Solve for x
   x = 673,835.77/554.25
6. Step 6: Final answer
   x = 1,215.76