Finding the Third Proportional to 158,139 and 231,618

Step by Step Solution

1. Step 1: Write the proportion equation
   158,139 : 231,618 = 231,618 : x
2. Step 2: Convert to fraction form
   158,139/231,618 = 231,618/x
3. Step 3: Cross multiply
   158,139x = 231,618 × 231,618
4. Step 4: Simplify right side
   158,139x = 53,646,897,924
5. Step 5: Solve for x
   x = 53,646,897,924/158,139
6. Step 6: Final answer
   x = 339,238.88