Finding the Third Proportional to 12,658.78 and 15,392.53

Step by Step Solution

1. Step 1: Write the proportion equation
   12,658.78 : 15,392.53 = 15,392.53 : x
2. Step 2: Convert to fraction form
   12,658.78/15,392.53 = 15,392.53/x
3. Step 3: Cross multiply
   12,658.78x = 15,392.53 × 15,392.53
4. Step 4: Simplify right side
   12,658.78x = 236,930,018.28
5. Step 5: Solve for x
   x = 236,930,018.28/12,658.78
6. Step 6: Final answer
   x = 18,716.65