Finding the Third Proportional to 21,018.94 and 30,720.09

Step by Step Solution

1. Step 1: Write the proportion equation
   21,018.94 : 30,720.09 = 30,720.09 : x
2. Step 2: Convert to fraction form
   21,018.94/30,720.09 = 30,720.09/x
3. Step 3: Cross multiply
   21,018.94x = 30,720.09 × 30,720.09
4. Step 4: Simplify right side
   21,018.94x = 943,724,160.01
5. Step 5: Solve for x
   x = 943,724,160.01/21,018.94
6. Step 6: Final answer
   x = 44,898.76