Finding the Third Proportional to 20,657 and 42,403

Step by Step Solution

1. Step 1: Write the proportion equation
   20,657 : 42,403 = 42,403 : x
2. Step 2: Convert to fraction form
   20,657/42,403 = 42,403/x
3. Step 3: Cross multiply
   20,657x = 42,403 × 42,403
4. Step 4: Simplify right side
   20,657x = 1,798,014,409
5. Step 5: Solve for x
   x = 1,798,014,409/20,657
6. Step 6: Final answer
   x = 87,041.41