Finding the Third Proportional to 20,422.13 and 28,648.69

Step by Step Solution

1. Step 1: Write the proportion equation
   20,422.13 : 28,648.69 = 28,648.69 : x
2. Step 2: Convert to fraction form
   20,422.13/28,648.69 = 28,648.69/x
3. Step 3: Cross multiply
   20,422.13x = 28,648.69 × 28,648.69
4. Step 4: Simplify right side
   20,422.13x = 820,747,295.47
5. Step 5: Solve for x
   x = 820,747,295.47/20,422.13
6. Step 6: Final answer
   x = 40,189.12