Finding the Third Proportional to 178,472 and 388,040

Step by Step Solution

1. Step 1: Write the proportion equation
   178,472 : 388,040 = 388,040 : x
2. Step 2: Convert to fraction form
   178,472/388,040 = 388,040/x
3. Step 3: Cross multiply
   178,472x = 388,040 × 388,040
4. Step 4: Simplify right side
   178,472x = 150,575,041,600
5. Step 5: Solve for x
   x = 150,575,041,600/178,472
6. Step 6: Final answer
   x = 843,690.00