Finding the Third Proportional to 4,018.78 and 8,815.71

Step by Step Solution

1. Step 1: Write the proportion equation
   4,018.78 : 8,815.71 = 8,815.71 : x
2. Step 2: Convert to fraction form
   4,018.78/8,815.71 = 8,815.71/x
3. Step 3: Cross multiply
   4,018.78x = 8,815.71 × 8,815.71
4. Step 4: Simplify right side
   4,018.78x = 77,716,759.33
5. Step 5: Solve for x
   x = 77,716,759.33/4,018.78
6. Step 6: Final answer
   x = 19,338.39