Finding the Third Proportional to 21,004.31 and 40,960.69

Step by Step Solution

1. Step 1: Write the proportion equation
   21,004.31 : 40,960.69 = 40,960.69 : x
2. Step 2: Convert to fraction form
   21,004.31/40,960.69 = 40,960.69/x
3. Step 3: Cross multiply
   21,004.31x = 40,960.69 × 40,960.69
4. Step 4: Simplify right side
   21,004.31x = 1,677,777,920.47
5. Step 5: Solve for x
   x = 1,677,777,920.47/21,004.31
6. Step 6: Final answer
   x = 79,877.78