Finding the Third Proportional to 3,609.56 and 5,518.69

Step by Step Solution

1. Step 1: Write the proportion equation
   3,609.56 : 5,518.69 = 5,518.69 : x
2. Step 2: Convert to fraction form
   3,609.56/5,518.69 = 5,518.69/x
3. Step 3: Cross multiply
   3,609.56x = 5,518.69 × 5,518.69
4. Step 4: Simplify right side
   3,609.56x = 30,455,911.72
5. Step 5: Solve for x
   x = 30,455,911.72/3,609.56
6. Step 6: Final answer
   x = 8,437.56