Finding the Third Proportional to 300.80 and 621.42

Step by Step Solution

1. Step 1: Write the proportion equation
   300.80 : 621.42 = 621.42 : x
2. Step 2: Convert to fraction form
   300.80/621.42 = 621.42/x
3. Step 3: Cross multiply
   300.80x = 621.42 × 621.42
4. Step 4: Simplify right side
   300.80x = 386,165.15
5. Step 5: Solve for x
   x = 386,165.15/300.80
6. Step 6: Final answer
   x = 1,283.81