Finding the Third Proportional to 20,221.21 and 42,057.04

Step by Step Solution

1. Step 1: Write the proportion equation
   20,221.21 : 42,057.04 = 42,057.04 : x
2. Step 2: Convert to fraction form
   20,221.21/42,057.04 = 42,057.04/x
3. Step 3: Cross multiply
   20,221.21x = 42,057.04 × 42,057.04
4. Step 4: Simplify right side
   20,221.21x = 1,768,794,206.13
5. Step 5: Solve for x
   x = 1,768,794,206.13/20,221.21
6. Step 6: Final answer
   x = 87,472.24