Finding the Third Proportional to 178,478 and 388,059.50

Step by Step Solution

1. Step 1: Write the proportion equation
   178,478 : 388,059.50 = 388,059.50 : x
2. Step 2: Convert to fraction form
   178,478/388,059.50 = 388,059.50/x
3. Step 3: Cross multiply
   178,478x = 388,059.50 × 388,059.50
4. Step 4: Simplify right side
   178,478x = 150,590,175,540.25
5. Step 5: Solve for x
   x = 150,590,175,540.25/178,478
6. Step 6: Final answer
   x = 843,746.43