Finding the Third Proportional to 178,861 and 388,784

Step by Step Solution

1. Step 1: Write the proportion equation
   178,861 : 388,784 = 388,784 : x
2. Step 2: Convert to fraction form
   178,861/388,784 = 388,784/x
3. Step 3: Cross multiply
   178,861x = 388,784 × 388,784
4. Step 4: Simplify right side
   178,861x = 151,152,998,656
5. Step 5: Solve for x
   x = 151,152,998,656/178,861
6. Step 6: Final answer
   x = 845,086.40