Finding the Third Proportional to 682.50 and 889.50

Step by Step Solution

1. Step 1: Write the proportion equation
   682.50 : 889.50 = 889.50 : x
2. Step 2: Convert to fraction form
   682.50/889.50 = 889.50/x
3. Step 3: Cross multiply
   682.50x = 889.50 × 889.50
4. Step 4: Simplify right side
   682.50x = 791,210.25
5. Step 5: Solve for x
   x = 791,210.25/682.50
6. Step 6: Final answer
   x = 1,159.28