Finding the Third Proportional to 15,120 and 19,864.50

Step by Step Solution

1. Step 1: Write the proportion equation
   15,120 : 19,864.50 = 19,864.50 : x
2. Step 2: Convert to fraction form
   15,120/19,864.50 = 19,864.50/x
3. Step 3: Cross multiply
   15,120x = 19,864.50 × 19,864.50
4. Step 4: Simplify right side
   15,120x = 394,598,360.25
5. Step 5: Solve for x
   x = 394,598,360.25/15,120
6. Step 6: Final answer
   x = 26,097.78