Finding the Third Proportional to 174,380 and 388,240

Step by Step Solution

1. Step 1: Write the proportion equation
   174,380 : 388,240 = 388,240 : x
2. Step 2: Convert to fraction form
   174,380/388,240 = 388,240/x
3. Step 3: Cross multiply
   174,380x = 388,240 × 388,240
4. Step 4: Simplify right side
   174,380x = 150,730,297,600
5. Step 5: Solve for x
   x = 150,730,297,600/174,380
6. Step 6: Final answer
   x = 864,378.36