Finding the Third Proportional to 425.25 and 618.89

Step by Step Solution

1. Step 1: Write the proportion equation
   425.25 : 618.89 = 618.89 : x
2. Step 2: Convert to fraction form
   425.25/618.89 = 618.89/x
3. Step 3: Cross multiply
   425.25x = 618.89 × 618.89
4. Step 4: Simplify right side
   425.25x = 383,025.61
5. Step 5: Solve for x
   x = 383,025.61/425.25
6. Step 6: Final answer
   x = 900.71