Finding the Third Proportional to 2,158 and 3,280

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158 : 3,280 = 3,280 : x
2. Step 2: Convert to fraction form
   2,158/3,280 = 3,280/x
3. Step 3: Cross multiply
   2,158x = 3,280 × 3,280
4. Step 4: Simplify right side
   2,158x = 10,758,400
5. Step 5: Solve for x
   x = 10,758,400/2,158
6. Step 6: Final answer
   x = 4,985.36