Finding the Third Proportional to 155,256 and 316,221.75

Step by Step Solution

1. Step 1: Write the proportion equation
   155,256 : 316,221.75 = 316,221.75 : x
2. Step 2: Convert to fraction form
   155,256/316,221.75 = 316,221.75/x
3. Step 3: Cross multiply
   155,256x = 316,221.75 × 316,221.75
4. Step 4: Simplify right side
   155,256x = 99,996,195,173.06
5. Step 5: Solve for x
   x = 99,996,195,173.06/155,256
6. Step 6: Final answer
   x = 644,072.98