Finding the Third Proportional to 2,018.28 and 4,209.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,018.28 : 4,209.55 = 4,209.55 : x
2. Step 2: Convert to fraction form
   2,018.28/4,209.55 = 4,209.55/x
3. Step 3: Cross multiply
   2,018.28x = 4,209.55 × 4,209.55
4. Step 4: Simplify right side
   2,018.28x = 17,720,293.11
5. Step 5: Solve for x
   x = 17,720,293.11/2,018.28
6. Step 6: Final answer
   x = 8,779.91