Finding the Third Proportional to 2,690 and 3,158

Step by Step Solution

1. Step 1: Write the proportion equation
   2,690 : 3,158 = 3,158 : x
2. Step 2: Convert to fraction form
   2,690/3,158 = 3,158/x
3. Step 3: Cross multiply
   2,690x = 3,158 × 3,158
4. Step 4: Simplify right side
   2,690x = 9,972,964
5. Step 5: Solve for x
   x = 9,972,964/2,690
6. Step 6: Final answer
   x = 3,707.42