Finding the Third Proportional to 2,940 and 3,390

Step by Step Solution

1. Step 1: Write the proportion equation
   2,940 : 3,390 = 3,390 : x
2. Step 2: Convert to fraction form
   2,940/3,390 = 3,390/x
3. Step 3: Cross multiply
   2,940x = 3,390 × 3,390
4. Step 4: Simplify right side
   2,940x = 11,492,100
5. Step 5: Solve for x
   x = 11,492,100/2,940
6. Step 6: Final answer
   x = 3,908.88