Finding the Third Proportional to 178,320 and 387,360

Step by Step Solution

1. Step 1: Write the proportion equation
   178,320 : 387,360 = 387,360 : x
2. Step 2: Convert to fraction form
   178,320/387,360 = 387,360/x
3. Step 3: Cross multiply
   178,320x = 387,360 × 387,360
4. Step 4: Simplify right side
   178,320x = 150,047,769,600
5. Step 5: Solve for x
   x = 150,047,769,600/178,320
6. Step 6: Final answer
   x = 841,452.27