Finding the Third Proportional to 158,700 and 210,618

Step by Step Solution

1. Step 1: Write the proportion equation
   158,700 : 210,618 = 210,618 : x
2. Step 2: Convert to fraction form
   158,700/210,618 = 210,618/x
3. Step 3: Cross multiply
   158,700x = 210,618 × 210,618
4. Step 4: Simplify right side
   158,700x = 44,359,941,924
5. Step 5: Solve for x
   x = 44,359,941,924/158,700
6. Step 6: Final answer
   x = 279,520.74