Finding the Third Proportional to 2,722.78 and 5,931.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,722.78 : 5,931.56 = 5,931.56 : x
2. Step 2: Convert to fraction form
   2,722.78/5,931.56 = 5,931.56/x
3. Step 3: Cross multiply
   2,722.78x = 5,931.56 × 5,931.56
4. Step 4: Simplify right side
   2,722.78x = 35,183,433.69
5. Step 5: Solve for x
   x = 35,183,433.69/2,722.78
6. Step 6: Final answer
   x = 12,921.87