Finding the Third Proportional to 12,159.49 and 14,688.21

Step by Step Solution

1. Step 1: Write the proportion equation
   12,159.49 : 14,688.21 = 14,688.21 : x
2. Step 2: Convert to fraction form
   12,159.49/14,688.21 = 14,688.21/x
3. Step 3: Cross multiply
   12,159.49x = 14,688.21 × 14,688.21
4. Step 4: Simplify right side
   12,159.49x = 215,743,540.54
5. Step 5: Solve for x
   x = 215,743,540.54/12,159.49
6. Step 6: Final answer
   x = 17,742.81