Finding the Third Proportional to 12,904.31 and 18,172.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,904.31 : 18,172.69 = 18,172.69 : x
2. Step 2: Convert to fraction form
   12,904.31/18,172.69 = 18,172.69/x
3. Step 3: Cross multiply
   12,904.31x = 18,172.69 × 18,172.69
4. Step 4: Simplify right side
   12,904.31x = 330,246,570.97
5. Step 5: Solve for x
   x = 330,246,570.97/12,904.31
6. Step 6: Final answer
   x = 25,591.95