Finding the Third Proportional to 8,359.88 and 12,985.88

Step by Step Solution

1. Step 1: Write the proportion equation
   8,359.88 : 12,985.88 = 12,985.88 : x
2. Step 2: Convert to fraction form
   8,359.88/12,985.88 = 12,985.88/x
3. Step 3: Cross multiply
   8,359.88x = 12,985.88 × 12,985.88
4. Step 4: Simplify right side
   8,359.88x = 168,632,949.52
5. Step 5: Solve for x
   x = 168,632,949.52/8,359.88
6. Step 6: Final answer
   x = 20,171.71