Finding the Third Proportional to 1,690 and 2,978

Step by Step Solution

1. Step 1: Write the proportion equation
   1,690 : 2,978 = 2,978 : x
2. Step 2: Convert to fraction form
   1,690/2,978 = 2,978/x
3. Step 3: Cross multiply
   1,690x = 2,978 × 2,978
4. Step 4: Simplify right side
   1,690x = 8,868,484
5. Step 5: Solve for x
   x = 8,868,484/1,690
6. Step 6: Final answer
   x = 5,247.62