Finding the Third Proportional to 1,078 and 1,216

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078 : 1,216 = 1,216 : x
2. Step 2: Convert to fraction form
   1,078/1,216 = 1,216/x
3. Step 3: Cross multiply
   1,078x = 1,216 × 1,216
4. Step 4: Simplify right side
   1,078x = 1,478,656
5. Step 5: Solve for x
   x = 1,478,656/1,078
6. Step 6: Final answer
   x = 1,371.67