Finding the Third Proportional to 21,086 and 31,618

Step by Step Solution

1. Step 1: Write the proportion equation
   21,086 : 31,618 = 31,618 : x
2. Step 2: Convert to fraction form
   21,086/31,618 = 31,618/x
3. Step 3: Cross multiply
   21,086x = 31,618 × 31,618
4. Step 4: Simplify right side
   21,086x = 999,697,924
5. Step 5: Solve for x
   x = 999,697,924/21,086
6. Step 6: Final answer
   x = 47,410.51