Finding the Third Proportional to 20,306.81 and 42,238.69

Step by Step Solution

1. Step 1: Write the proportion equation
   20,306.81 : 42,238.69 = 42,238.69 : x
2. Step 2: Convert to fraction form
   20,306.81/42,238.69 = 42,238.69/x
3. Step 3: Cross multiply
   20,306.81x = 42,238.69 × 42,238.69
4. Step 4: Simplify right side
   20,306.81x = 1,784,106,721.72
5. Step 5: Solve for x
   x = 1,784,106,721.72/20,306.81
6. Step 6: Final answer
   x = 87,857.55