Finding the Third Proportional to 301.50 and 428.81

Step by Step Solution

1. Step 1: Write the proportion equation
   301.50 : 428.81 = 428.81 : x
2. Step 2: Convert to fraction form
   301.50/428.81 = 428.81/x
3. Step 3: Cross multiply
   301.50x = 428.81 × 428.81
4. Step 4: Simplify right side
   301.50x = 183,880.16
5. Step 5: Solve for x
   x = 183,880.16/301.50
6. Step 6: Final answer
   x = 609.88