Finding the Third Proportional to 908.50 and 989.50

Step by Step Solution

1. Step 1: Write the proportion equation
   908.50 : 989.50 = 989.50 : x
2. Step 2: Convert to fraction form
   908.50/989.50 = 989.50/x
3. Step 3: Cross multiply
   908.50x = 989.50 × 989.50
4. Step 4: Simplify right side
   908.50x = 979,110.25
5. Step 5: Solve for x
   x = 979,110.25/908.50
6. Step 6: Final answer
   x = 1,077.72