Finding the Third Proportional to 1,809.09 and 3,959.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,809.09 : 3,959.89 = 3,959.89 : x
2. Step 2: Convert to fraction form
   1,809.09/3,959.89 = 3,959.89/x
3. Step 3: Cross multiply
   1,809.09x = 3,959.89 × 3,959.89
4. Step 4: Simplify right side
   1,809.09x = 15,680,729.89
5. Step 5: Solve for x
   x = 15,680,729.89/1,809.09
6. Step 6: Final answer
   x = 8,667.77