Finding the Third Proportional to 19,879 and 42,057

Step by Step Solution

1. Step 1: Write the proportion equation
   19,879 : 42,057 = 42,057 : x
2. Step 2: Convert to fraction form
   19,879/42,057 = 42,057/x
3. Step 3: Cross multiply
   19,879x = 42,057 × 42,057
4. Step 4: Simplify right side
   19,879x = 1,768,791,249
5. Step 5: Solve for x
   x = 1,768,791,249/19,879
6. Step 6: Final answer
   x = 88,977.88