Finding the Third Proportional to 178,316 and 388,618

Step by Step Solution

1. Step 1: Write the proportion equation
   178,316 : 388,618 = 388,618 : x
2. Step 2: Convert to fraction form
   178,316/388,618 = 388,618/x
3. Step 3: Cross multiply
   178,316x = 388,618 × 388,618
4. Step 4: Simplify right side
   178,316x = 151,023,949,924
5. Step 5: Solve for x
   x = 151,023,949,924/178,316
6. Step 6: Final answer
   x = 846,945.59