Finding the Third Proportional to 300.80 and 383.91

Step by Step Solution

1. Step 1: Write the proportion equation
   300.80 : 383.91 = 383.91 : x
2. Step 2: Convert to fraction form
   300.80/383.91 = 383.91/x
3. Step 3: Cross multiply
   300.80x = 383.91 × 383.91
4. Step 4: Simplify right side
   300.80x = 147,384.01
5. Step 5: Solve for x
   x = 147,384.01/300.80
6. Step 6: Final answer
   x = 489.98