Finding the Third Proportional to 181,300 and 398,490

Step by Step Solution

1. Step 1: Write the proportion equation
   181,300 : 398,490 = 398,490 : x
2. Step 2: Convert to fraction form
   181,300/398,490 = 398,490/x
3. Step 3: Cross multiply
   181,300x = 398,490 × 398,490
4. Step 4: Simplify right side
   181,300x = 158,794,280,100
5. Step 5: Solve for x
   x = 158,794,280,100/181,300
6. Step 6: Final answer
   x = 875,864.76