Finding the Third Proportional to 139,864 and 215,106

Step by Step Solution

1. Step 1: Write the proportion equation
   139,864 : 215,106 = 215,106 : x
2. Step 2: Convert to fraction form
   139,864/215,106 = 215,106/x
3. Step 3: Cross multiply
   139,864x = 215,106 × 215,106
4. Step 4: Simplify right side
   139,864x = 46,270,591,236
5. Step 5: Solve for x
   x = 46,270,591,236/139,864
6. Step 6: Final answer
   x = 330,825.60