Finding the Third Proportional to 139,440 and 331,320

Step by Step Solution

1. Step 1: Write the proportion equation
   139,440 : 331,320 = 331,320 : x
2. Step 2: Convert to fraction form
   139,440/331,320 = 331,320/x
3. Step 3: Cross multiply
   139,440x = 331,320 × 331,320
4. Step 4: Simplify right side
   139,440x = 109,772,942,400
5. Step 5: Solve for x
   x = 109,772,942,400/139,440
6. Step 6: Final answer
   x = 787,241.41