Finding the Third Proportional to 20,800 and 42,572

Step by Step Solution

1. Step 1: Write the proportion equation
   20,800 : 42,572 = 42,572 : x
2. Step 2: Convert to fraction form
   20,800/42,572 = 42,572/x
3. Step 3: Cross multiply
   20,800x = 42,572 × 42,572
4. Step 4: Simplify right side
   20,800x = 1,812,375,184
5. Step 5: Solve for x
   x = 1,812,375,184/20,800
6. Step 6: Final answer
   x = 87,133.42