Finding the Third Proportional to 139,866 and 215,109

Step by Step Solution

1. Step 1: Write the proportion equation
   139,866 : 215,109 = 215,109 : x
2. Step 2: Convert to fraction form
   139,866/215,109 = 215,109/x
3. Step 3: Cross multiply
   139,866x = 215,109 × 215,109
4. Step 4: Simplify right side
   139,866x = 46,271,881,881
5. Step 5: Solve for x
   x = 46,271,881,881/139,866
6. Step 6: Final answer
   x = 330,830.09