Finding the Third Proportional to 11,986 and 28,405

Step by Step Solution

1. Step 1: Write the proportion equation
   11,986 : 28,405 = 28,405 : x
2. Step 2: Convert to fraction form
   11,986/28,405 = 28,405/x
3. Step 3: Cross multiply
   11,986x = 28,405 × 28,405
4. Step 4: Simplify right side
   11,986x = 806,844,025
5. Step 5: Solve for x
   x = 806,844,025/11,986
6. Step 6: Final answer
   x = 67,315.54