Finding the Third Proportional to 2,605.61 and 5,518.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,605.61 : 5,518.76 = 5,518.76 : x
2. Step 2: Convert to fraction form
   2,605.61/5,518.76 = 5,518.76/x
3. Step 3: Cross multiply
   2,605.61x = 5,518.76 × 5,518.76
4. Step 4: Simplify right side
   2,605.61x = 30,456,687.79
5. Step 5: Solve for x
   x = 30,456,687.79/2,605.61
6. Step 6: Final answer
   x = 11,688.91