Finding the Third Proportional to 621.38 and 885.38

Step by Step Solution

1. Step 1: Write the proportion equation
   621.38 : 885.38 = 885.38 : x
2. Step 2: Convert to fraction form
   621.38/885.38 = 885.38/x
3. Step 3: Cross multiply
   621.38x = 885.38 × 885.38
4. Step 4: Simplify right side
   621.38x = 783,888.89
5. Step 5: Solve for x
   x = 783,888.89/621.38
6. Step 6: Final answer
   x = 1,261.54