Finding the Third Proportional to 139,696 and 216,480

Step by Step Solution

1. Step 1: Write the proportion equation
   139,696 : 216,480 = 216,480 : x
2. Step 2: Convert to fraction form
   139,696/216,480 = 216,480/x
3. Step 3: Cross multiply
   139,696x = 216,480 × 216,480
4. Step 4: Simplify right side
   139,696x = 46,863,590,400
5. Step 5: Solve for x
   x = 46,863,590,400/139,696
6. Step 6: Final answer
   x = 335,468.38