Finding the Third Proportional to 8,485 and 12,357.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,485 : 12,357.50 = 12,357.50 : x
2. Step 2: Convert to fraction form
   8,485/12,357.50 = 12,357.50/x
3. Step 3: Cross multiply
   8,485x = 12,357.50 × 12,357.50
4. Step 4: Simplify right side
   8,485x = 152,707,806.25
5. Step 5: Solve for x
   x = 152,707,806.25/8,485
6. Step 6: Final answer
   x = 17,997.38