Finding the Third Proportional to 2,661 and 5,389.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661 : 5,389.50 = 5,389.50 : x
2. Step 2: Convert to fraction form
   2,661/5,389.50 = 5,389.50/x
3. Step 3: Cross multiply
   2,661x = 5,389.50 × 5,389.50
4. Step 4: Simplify right side
   2,661x = 29,046,710.25
5. Step 5: Solve for x
   x = 29,046,710.25/2,661
6. Step 6: Final answer
   x = 10,915.71