Finding the Third Proportional to 259,900 and 388,792

Step by Step Solution

1. Step 1: Write the proportion equation
   259,900 : 388,792 = 388,792 : x
2. Step 2: Convert to fraction form
   259,900/388,792 = 388,792/x
3. Step 3: Cross multiply
   259,900x = 388,792 × 388,792
4. Step 4: Simplify right side
   259,900x = 151,159,219,264
5. Step 5: Solve for x
   x = 151,159,219,264/259,900
6. Step 6: Final answer
   x = 581,605.31