Finding the Third Proportional to 994.78 and 1,391.55

Step by Step Solution

1. Step 1: Write the proportion equation
   994.78 : 1,391.55 = 1,391.55 : x
2. Step 2: Convert to fraction form
   994.78/1,391.55 = 1,391.55/x
3. Step 3: Cross multiply
   994.78x = 1,391.55 × 1,391.55
4. Step 4: Simplify right side
   994.78x = 1,936,424.45
5. Step 5: Solve for x
   x = 1,936,424.45/994.78
6. Step 6: Final answer
   x = 1,946.58