Finding the Third Proportional to 428.38 and 890.38

Step by Step Solution

1. Step 1: Write the proportion equation
   428.38 : 890.38 = 890.38 : x
2. Step 2: Convert to fraction form
   428.38/890.38 = 890.38/x
3. Step 3: Cross multiply
   428.38x = 890.38 × 890.38
4. Step 4: Simplify right side
   428.38x = 792,767.64
5. Step 5: Solve for x
   x = 792,767.64/428.38
6. Step 6: Final answer
   x = 1,850.64