Finding the Third Proportional to 712.50 and 838.50

Step by Step Solution

1. Step 1: Write the proportion equation
   712.50 : 838.50 = 838.50 : x
2. Step 2: Convert to fraction form
   712.50/838.50 = 838.50/x
3. Step 3: Cross multiply
   712.50x = 838.50 × 838.50
4. Step 4: Simplify right side
   712.50x = 703,082.25
5. Step 5: Solve for x
   x = 703,082.25/712.50
6. Step 6: Final answer
   x = 986.78