Finding the Third Proportional to 139,816 and 222,390

Step by Step Solution

1. Step 1: Write the proportion equation
   139,816 : 222,390 = 222,390 : x
2. Step 2: Convert to fraction form
   139,816/222,390 = 222,390/x
3. Step 3: Cross multiply
   139,816x = 222,390 × 222,390
4. Step 4: Simplify right side
   139,816x = 49,457,312,100
5. Step 5: Solve for x
   x = 49,457,312,100/139,816
6. Step 6: Final answer
   x = 353,731.42