Finding the Third Proportional to 163,520 and 333,920

Step by Step Solution

1. Step 1: Write the proportion equation
   163,520 : 333,920 = 333,920 : x
2. Step 2: Convert to fraction form
   163,520/333,920 = 333,920/x
3. Step 3: Cross multiply
   163,520x = 333,920 × 333,920
4. Step 4: Simplify right side
   163,520x = 111,502,566,400
5. Step 5: Solve for x
   x = 111,502,566,400/163,520
6. Step 6: Final answer
   x = 681,889.47