Finding the Third Proportional to 156,978 and 343,618

Step by Step Solution

1. Step 1: Write the proportion equation
   156,978 : 343,618 = 343,618 : x
2. Step 2: Convert to fraction form
   156,978/343,618 = 343,618/x
3. Step 3: Cross multiply
   156,978x = 343,618 × 343,618
4. Step 4: Simplify right side
   156,978x = 118,073,329,924
5. Step 5: Solve for x
   x = 118,073,329,924/156,978
6. Step 6: Final answer
   x = 752,164.83