Finding the Third Proportional to 20,430 and 30,768.75

Step by Step Solution

1. Step 1: Write the proportion equation
   20,430 : 30,768.75 = 30,768.75 : x
2. Step 2: Convert to fraction form
   20,430/30,768.75 = 30,768.75/x
3. Step 3: Cross multiply
   20,430x = 30,768.75 × 30,768.75
4. Step 4: Simplify right side
   20,430x = 946,715,976.56
5. Step 5: Solve for x
   x = 946,715,976.56/20,430
6. Step 6: Final answer
   x = 46,339.50