Finding the Third Proportional to 20,389.69 and 28,712.81

Step by Step Solution

1. Step 1: Write the proportion equation
   20,389.69 : 28,712.81 = 28,712.81 : x
2. Step 2: Convert to fraction form
   20,389.69/28,712.81 = 28,712.81/x
3. Step 3: Cross multiply
   20,389.69x = 28,712.81 × 28,712.81
4. Step 4: Simplify right side
   20,389.69x = 824,425,601.66
5. Step 5: Solve for x
   x = 824,425,601.66/20,389.69
6. Step 6: Final answer
   x = 40,433.46