Finding the Third Proportional to 7,807.50 and 12,009

Step by Step Solution

1. Step 1: Write the proportion equation
   7,807.50 : 12,009 = 12,009 : x
2. Step 2: Convert to fraction form
   7,807.50/12,009 = 12,009/x
3. Step 3: Cross multiply
   7,807.50x = 12,009 × 12,009
4. Step 4: Simplify right side
   7,807.50x = 144,216,081
5. Step 5: Solve for x
   x = 144,216,081/7,807.50
6. Step 6: Final answer
   x = 18,471.48