Finding the Third Proportional to 2,478 and 5,340

Step by Step Solution

1. Step 1: Write the proportion equation
   2,478 : 5,340 = 5,340 : x
2. Step 2: Convert to fraction form
   2,478/5,340 = 5,340/x
3. Step 3: Cross multiply
   2,478x = 5,340 × 5,340
4. Step 4: Simplify right side
   2,478x = 28,515,600
5. Step 5: Solve for x
   x = 28,515,600/2,478
6. Step 6: Final answer
   x = 11,507.51