Finding the Third Proportional to 1,399.78 and 3,018.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.78 : 3,018.52 = 3,018.52 : x
2. Step 2: Convert to fraction form
   1,399.78/3,018.52 = 3,018.52/x
3. Step 3: Cross multiply
   1,399.78x = 3,018.52 × 3,018.52
4. Step 4: Simplify right side
   1,399.78x = 9,111,436.58
5. Step 5: Solve for x
   x = 9,111,436.58/1,399.78
6. Step 6: Final answer
   x = 6,509.19