Finding the Third Proportional to 144,203 and 215,109

Step by Step Solution

1. Step 1: Write the proportion equation
   144,203 : 215,109 = 215,109 : x
2. Step 2: Convert to fraction form
   144,203/215,109 = 215,109/x
3. Step 3: Cross multiply
   144,203x = 215,109 × 215,109
4. Step 4: Simplify right side
   144,203x = 46,271,881,881
5. Step 5: Solve for x
   x = 46,271,881,881/144,203
6. Step 6: Final answer
   x = 320,880.16