Finding the Third Proportional to 2,619 and 4,099.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,619 : 4,099.50 = 4,099.50 : x
2. Step 2: Convert to fraction form
   2,619/4,099.50 = 4,099.50/x
3. Step 3: Cross multiply
   2,619x = 4,099.50 × 4,099.50
4. Step 4: Simplify right side
   2,619x = 16,805,900.25
5. Step 5: Solve for x
   x = 16,805,900.25/2,619
6. Step 6: Final answer
   x = 6,416.91