Finding the Third Proportional to 20,309.25 and 42,243.75

Step by Step Solution

1. Step 1: Write the proportion equation
   20,309.25 : 42,243.75 = 42,243.75 : x
2. Step 2: Convert to fraction form
   20,309.25/42,243.75 = 42,243.75/x
3. Step 3: Cross multiply
   20,309.25x = 42,243.75 × 42,243.75
4. Step 4: Simplify right side
   20,309.25x = 1,784,534,414.06
5. Step 5: Solve for x
   x = 1,784,534,414.06/20,309.25
6. Step 6: Final answer
   x = 87,868.06