Finding the Third Proportional to 19,871 and 42,111

Step by Step Solution

1. Step 1: Write the proportion equation
   19,871 : 42,111 = 42,111 : x
2. Step 2: Convert to fraction form
   19,871/42,111 = 42,111/x
3. Step 3: Cross multiply
   19,871x = 42,111 × 42,111
4. Step 4: Simplify right side
   19,871x = 1,773,336,321
5. Step 5: Solve for x
   x = 1,773,336,321/19,871
6. Step 6: Final answer
   x = 89,242.43