Finding the Third Proportional to 2,911.78 and 4,018.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,911.78 : 4,018.78 = 4,018.78 : x
2. Step 2: Convert to fraction form
   2,911.78/4,018.78 = 4,018.78/x
3. Step 3: Cross multiply
   2,911.78x = 4,018.78 × 4,018.78
4. Step 4: Simplify right side
   2,911.78x = 16,150,602.74
5. Step 5: Solve for x
   x = 16,150,602.74/2,911.78
6. Step 6: Final answer
   x = 5,546.64