Finding the Third Proportional to 20,128 and 42,528

Step by Step Solution

1. Step 1: Write the proportion equation
   20,128 : 42,528 = 42,528 : x
2. Step 2: Convert to fraction form
   20,128/42,528 = 42,528/x
3. Step 3: Cross multiply
   20,128x = 42,528 × 42,528
4. Step 4: Simplify right side
   20,128x = 1,808,630,784
5. Step 5: Solve for x
   x = 1,808,630,784/20,128
6. Step 6: Final answer
   x = 89,856.46