Finding the Third Proportional to 2,647.69 and 3,890.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,647.69 : 3,890.53 = 3,890.53 : x
2. Step 2: Convert to fraction form
   2,647.69/3,890.53 = 3,890.53/x
3. Step 3: Cross multiply
   2,647.69x = 3,890.53 × 3,890.53
4. Step 4: Simplify right side
   2,647.69x = 15,136,233.41
5. Step 5: Solve for x
   x = 15,136,233.41/2,647.69
6. Step 6: Final answer
   x = 5,716.77