Finding the Third Proportional to 3,618.17 and 7,919.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,618.17 : 7,919.78 = 7,919.78 : x
2. Step 2: Convert to fraction form
   3,618.17/7,919.78 = 7,919.78/x
3. Step 3: Cross multiply
   3,618.17x = 7,919.78 × 7,919.78
4. Step 4: Simplify right side
   3,618.17x = 62,722,919.58
5. Step 5: Solve for x
   x = 62,722,919.58/3,618.17
6. Step 6: Final answer
   x = 17,335.53