Finding the Third Proportional to 15,109.88 and 21,240.56

Step by Step Solution

1. Step 1: Write the proportion equation
   15,109.88 : 21,240.56 = 21,240.56 : x
2. Step 2: Convert to fraction form
   15,109.88/21,240.56 = 21,240.56/x
3. Step 3: Cross multiply
   15,109.88x = 21,240.56 × 21,240.56
4. Step 4: Simplify right side
   15,109.88x = 451,161,495.32
5. Step 5: Solve for x
   x = 451,161,495.32/15,109.88
6. Step 6: Final answer
   x = 29,858.72