Finding the Third Proportional to 30,809.25 and 63,078.75

Step by Step Solution

1. Step 1: Write the proportion equation
   30,809.25 : 63,078.75 = 63,078.75 : x
2. Step 2: Convert to fraction form
   30,809.25/63,078.75 = 63,078.75/x
3. Step 3: Cross multiply
   30,809.25x = 63,078.75 × 63,078.75
4. Step 4: Simplify right side
   30,809.25x = 3,978,928,701.56
5. Step 5: Solve for x
   x = 3,978,928,701.56/30,809.25
6. Step 6: Final answer
   x = 129,147.21