Finding the Third Proportional to 256,912 and 395,196

Step by Step Solution

1. Step 1: Write the proportion equation
   256,912 : 395,196 = 395,196 : x
2. Step 2: Convert to fraction form
   256,912/395,196 = 395,196/x
3. Step 3: Cross multiply
   256,912x = 395,196 × 395,196
4. Step 4: Simplify right side
   256,912x = 156,179,878,416
5. Step 5: Solve for x
   x = 156,179,878,416/256,912
6. Step 6: Final answer
   x = 607,911.96