Finding the Third Proportional to 12,815.25 and 19,889.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,815.25 : 19,889.25 = 19,889.25 : x
2. Step 2: Convert to fraction form
   12,815.25/19,889.25 = 19,889.25/x
3. Step 3: Cross multiply
   12,815.25x = 19,889.25 × 19,889.25
4. Step 4: Simplify right side
   12,815.25x = 395,582,265.56
5. Step 5: Solve for x
   x = 395,582,265.56/12,815.25
6. Step 6: Final answer
   x = 30,868.09