Finding the Third Proportional to 2,389.90 and 5,124.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,389.90 : 5,124.18 = 5,124.18 : x
2. Step 2: Convert to fraction form
   2,389.90/5,124.18 = 5,124.18/x
3. Step 3: Cross multiply
   2,389.90x = 5,124.18 × 5,124.18
4. Step 4: Simplify right side
   2,389.90x = 26,257,214.97
5. Step 5: Solve for x
   x = 26,257,214.97/2,389.90
6. Step 6: Final answer
   x = 10,986.76