Finding the Third Proportional to 8,403.75 and 9,679.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,403.75 : 9,679.50 = 9,679.50 : x
2. Step 2: Convert to fraction form
   8,403.75/9,679.50 = 9,679.50/x
3. Step 3: Cross multiply
   8,403.75x = 9,679.50 × 9,679.50
4. Step 4: Simplify right side
   8,403.75x = 93,692,720.25
5. Step 5: Solve for x
   x = 93,692,720.25/8,403.75
6. Step 6: Final answer
   x = 11,148.92