Finding the Third Proportional to 554.77 and 788.55

Step by Step Solution

1. Step 1: Write the proportion equation
   554.77 : 788.55 = 788.55 : x
2. Step 2: Convert to fraction form
   554.77/788.55 = 788.55/x
3. Step 3: Cross multiply
   554.77x = 788.55 × 788.55
4. Step 4: Simplify right side
   554.77x = 621,818.50
5. Step 5: Solve for x
   x = 621,818.50/554.77
6. Step 6: Final answer
   x = 1,120.87