Finding the Third Proportional to 139,256 and 285,886

Step by Step Solution

1. Step 1: Write the proportion equation
   139,256 : 285,886 = 285,886 : x
2. Step 2: Convert to fraction form
   139,256/285,886 = 285,886/x
3. Step 3: Cross multiply
   139,256x = 285,886 × 285,886
4. Step 4: Simplify right side
   139,256x = 81,730,804,996
5. Step 5: Solve for x
   x = 81,730,804,996/139,256
6. Step 6: Final answer
   x = 586,910.47