Finding the Third Proportional to 284.29 and 620.31

Step by Step Solution

1. Step 1: Write the proportion equation
   284.29 : 620.31 = 620.31 : x
2. Step 2: Convert to fraction form
   284.29/620.31 = 620.31/x
3. Step 3: Cross multiply
   284.29x = 620.31 × 620.31
4. Step 4: Simplify right side
   284.29x = 384,790.02
5. Step 5: Solve for x
   x = 384,790.02/284.29
6. Step 6: Final answer
   x = 1,353.51