Finding the Third Proportional to 8,635.75 and 12,900.25

Step by Step Solution

1. Step 1: Write the proportion equation
   8,635.75 : 12,900.25 = 12,900.25 : x
2. Step 2: Convert to fraction form
   8,635.75/12,900.25 = 12,900.25/x
3. Step 3: Cross multiply
   8,635.75x = 12,900.25 × 12,900.25
4. Step 4: Simplify right side
   8,635.75x = 166,416,450.06
5. Step 5: Solve for x
   x = 166,416,450.06/8,635.75
6. Step 6: Final answer
   x = 19,270.64