Finding the Third Proportional to 9,678 and 12,667.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,678 : 12,667.50 = 12,667.50 : x
2. Step 2: Convert to fraction form
   9,678/12,667.50 = 12,667.50/x
3. Step 3: Cross multiply
   9,678x = 12,667.50 × 12,667.50
4. Step 4: Simplify right side
   9,678x = 160,465,556.25
5. Step 5: Solve for x
   x = 160,465,556.25/9,678
6. Step 6: Final answer
   x = 16,580.45