Finding the Third Proportional to 139,684 and 216,245

Step by Step Solution

1. Step 1: Write the proportion equation
   139,684 : 216,245 = 216,245 : x
2. Step 2: Convert to fraction form
   139,684/216,245 = 216,245/x
3. Step 3: Cross multiply
   139,684x = 216,245 × 216,245
4. Step 4: Simplify right side
   139,684x = 46,761,900,025
5. Step 5: Solve for x
   x = 46,761,900,025/139,684
6. Step 6: Final answer
   x = 334,769.19