Finding the Third Proportional to 139,028 and 230,109

Step by Step Solution

1. Step 1: Write the proportion equation
   139,028 : 230,109 = 230,109 : x
2. Step 2: Convert to fraction form
   139,028/230,109 = 230,109/x
3. Step 3: Cross multiply
   139,028x = 230,109 × 230,109
4. Step 4: Simplify right side
   139,028x = 52,950,151,881
5. Step 5: Solve for x
   x = 52,950,151,881/139,028
6. Step 6: Final answer
   x = 380,859.62