Finding the Third Proportional to 145,670 and 317,820

Step by Step Solution

1. Step 1: Write the proportion equation
   145,670 : 317,820 = 317,820 : x
2. Step 2: Convert to fraction form
   145,670/317,820 = 317,820/x
3. Step 3: Cross multiply
   145,670x = 317,820 × 317,820
4. Step 4: Simplify right side
   145,670x = 101,009,552,400
5. Step 5: Solve for x
   x = 101,009,552,400/145,670
6. Step 6: Final answer
   x = 693,413.55