Finding the Third Proportional to 15,121.69 and 21,270.09

Step by Step Solution

1. Step 1: Write the proportion equation
   15,121.69 : 21,270.09 = 21,270.09 : x
2. Step 2: Convert to fraction form
   15,121.69/21,270.09 = 21,270.09/x
3. Step 3: Cross multiply
   15,121.69x = 21,270.09 × 21,270.09
4. Step 4: Simplify right side
   15,121.69x = 452,416,888.13
5. Step 5: Solve for x
   x = 452,416,888.13/15,121.69
6. Step 6: Final answer
   x = 29,918.41