Finding the Third Proportional to 139,809 and 222,381.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,809 : 222,381.50 = 222,381.50 : x
2. Step 2: Convert to fraction form
   139,809/222,381.50 = 222,381.50/x
3. Step 3: Cross multiply
   139,809x = 222,381.50 × 222,381.50
4. Step 4: Simplify right side
   139,809x = 49,453,531,542.25
5. Step 5: Solve for x
   x = 49,453,531,542.25/139,809
6. Step 6: Final answer
   x = 353,722.09