Finding the Third Proportional to 5,418.56 and 12,589.59

Step by Step Solution

1. Step 1: Write the proportion equation
   5,418.56 : 12,589.59 = 12,589.59 : x
2. Step 2: Convert to fraction form
   5,418.56/12,589.59 = 12,589.59/x
3. Step 3: Cross multiply
   5,418.56x = 12,589.59 × 12,589.59
4. Step 4: Simplify right side
   5,418.56x = 158,497,870.79
5. Step 5: Solve for x
   x = 158,497,870.79/5,418.56
6. Step 6: Final answer
   x = 29,250.91