Finding the Third Proportional to 15,009.75 and 19,921.50

Step by Step Solution

1. Step 1: Write the proportion equation
   15,009.75 : 19,921.50 = 19,921.50 : x
2. Step 2: Convert to fraction form
   15,009.75/19,921.50 = 19,921.50/x
3. Step 3: Cross multiply
   15,009.75x = 19,921.50 × 19,921.50
4. Step 4: Simplify right side
   15,009.75x = 396,866,162.25
5. Step 5: Solve for x
   x = 396,866,162.25/15,009.75
6. Step 6: Final answer
   x = 26,440.56