Finding the Third Proportional to 42,618 and 89,729

Step by Step Solution

1. Step 1: Write the proportion equation
   42,618 : 89,729 = 89,729 : x
2. Step 2: Convert to fraction form
   42,618/89,729 = 89,729/x
3. Step 3: Cross multiply
   42,618x = 89,729 × 89,729
4. Step 4: Simplify right side
   42,618x = 8,051,293,441
5. Step 5: Solve for x
   x = 8,051,293,441/42,618
6. Step 6: Final answer
   x = 188,917.67