Finding the Third Proportional to 3,218 and 3,490

Step by Step Solution

1. Step 1: Write the proportion equation
   3,218 : 3,490 = 3,490 : x
2. Step 2: Convert to fraction form
   3,218/3,490 = 3,490/x
3. Step 3: Cross multiply
   3,218x = 3,490 × 3,490
4. Step 4: Simplify right side
   3,218x = 12,180,100
5. Step 5: Solve for x
   x = 12,180,100/3,218
6. Step 6: Final answer
   x = 3,784.99