Finding the Third Proportional to 2,560.69 and 5,510.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,560.69 : 5,510.63 = 5,510.63 : x
2. Step 2: Convert to fraction form
   2,560.69/5,510.63 = 5,510.63/x
3. Step 3: Cross multiply
   2,560.69x = 5,510.63 × 5,510.63
4. Step 4: Simplify right side
   2,560.69x = 30,366,987.89
5. Step 5: Solve for x
   x = 30,366,987.89/2,560.69
6. Step 6: Final answer
   x = 11,858.92