Finding the Third Proportional to 12,678.75 and 19,518.75

Step by Step Solution

1. Step 1: Write the proportion equation
   12,678.75 : 19,518.75 = 19,518.75 : x
2. Step 2: Convert to fraction form
   12,678.75/19,518.75 = 19,518.75/x
3. Step 3: Cross multiply
   12,678.75x = 19,518.75 × 19,518.75
4. Step 4: Simplify right side
   12,678.75x = 380,981,601.56
5. Step 5: Solve for x
   x = 380,981,601.56/12,678.75
6. Step 6: Final answer
   x = 30,048.83