Finding the Third Proportional to 156,256 and 248,436

Step by Step Solution

1. Step 1: Write the proportion equation
   156,256 : 248,436 = 248,436 : x
2. Step 2: Convert to fraction form
   156,256/248,436 = 248,436/x
3. Step 3: Cross multiply
   156,256x = 248,436 × 248,436
4. Step 4: Simplify right side
   156,256x = 61,720,446,096
5. Step 5: Solve for x
   x = 61,720,446,096/156,256
6. Step 6: Final answer
   x = 394,995.69