Finding the Third Proportional to 2,576.81 and 5,518.13

Step by Step Solution

1. Step 1: Write the proportion equation
   2,576.81 : 5,518.13 = 5,518.13 : x
2. Step 2: Convert to fraction form
   2,576.81/5,518.13 = 5,518.13/x
3. Step 3: Cross multiply
   2,576.81x = 5,518.13 × 5,518.13
4. Step 4: Simplify right side
   2,576.81x = 30,449,703.52
5. Step 5: Solve for x
   x = 30,449,703.52/2,576.81
6. Step 6: Final answer
   x = 11,816.81