Finding the Third Proportional to 5,439 and 12,882

Step by Step Solution

1. Step 1: Write the proportion equation
   5,439 : 12,882 = 12,882 : x
2. Step 2: Convert to fraction form
   5,439/12,882 = 12,882/x
3. Step 3: Cross multiply
   5,439x = 12,882 × 12,882
4. Step 4: Simplify right side
   5,439x = 165,945,924
5. Step 5: Solve for x
   x = 165,945,924/5,439
6. Step 6: Final answer
   x = 30,510.37