Finding the Third Proportional to 300.38 and 619.88

Step by Step Solution

1. Step 1: Write the proportion equation
   300.38 : 619.88 = 619.88 : x
2. Step 2: Convert to fraction form
   300.38/619.88 = 619.88/x
3. Step 3: Cross multiply
   300.38x = 619.88 × 619.88
4. Step 4: Simplify right side
   300.38x = 384,245.02
5. Step 5: Solve for x
   x = 384,245.02/300.38
6. Step 6: Final answer
   x = 1,279.22