Finding the Third Proportional to 145,436 and 317,152

Step by Step Solution

1. Step 1: Write the proportion equation
   145,436 : 317,152 = 317,152 : x
2. Step 2: Convert to fraction form
   145,436/317,152 = 317,152/x
3. Step 3: Cross multiply
   145,436x = 317,152 × 317,152
4. Step 4: Simplify right side
   145,436x = 100,585,391,104
5. Step 5: Solve for x
   x = 100,585,391,104/145,436
6. Step 6: Final answer
   x = 691,612.74