Finding the Third Proportional to 178,312 and 388,610

Step by Step Solution

1. Step 1: Write the proportion equation
   178,312 : 388,610 = 388,610 : x
2. Step 2: Convert to fraction form
   178,312/388,610 = 388,610/x
3. Step 3: Cross multiply
   178,312x = 388,610 × 388,610
4. Step 4: Simplify right side
   178,312x = 151,017,732,100
5. Step 5: Solve for x
   x = 151,017,732,100/178,312
6. Step 6: Final answer
   x = 846,929.72