Finding the Third Proportional to 8,722.69 and 12,458.81

Step by Step Solution

1. Step 1: Write the proportion equation
   8,722.69 : 12,458.81 = 12,458.81 : x
2. Step 2: Convert to fraction form
   8,722.69/12,458.81 = 12,458.81/x
3. Step 3: Cross multiply
   8,722.69x = 12,458.81 × 12,458.81
4. Step 4: Simplify right side
   8,722.69x = 155,222,008.91
5. Step 5: Solve for x
   x = 155,222,008.91/8,722.69
6. Step 6: Final answer
   x = 17,795.20