Finding the Third Proportional to 268,730 and 388,470

Step by Step Solution

1. Step 1: Write the proportion equation
   268,730 : 388,470 = 388,470 : x
2. Step 2: Convert to fraction form
   268,730/388,470 = 388,470/x
3. Step 3: Cross multiply
   268,730x = 388,470 × 388,470
4. Step 4: Simplify right side
   268,730x = 150,908,940,900
5. Step 5: Solve for x
   x = 150,908,940,900/268,730
6. Step 6: Final answer
   x = 561,563.43