Finding the Third Proportional to 155,248 and 320,406

Step by Step Solution

1. Step 1: Write the proportion equation
   155,248 : 320,406 = 320,406 : x
2. Step 2: Convert to fraction form
   155,248/320,406 = 320,406/x
3. Step 3: Cross multiply
   155,248x = 320,406 × 320,406
4. Step 4: Simplify right side
   155,248x = 102,660,004,836
5. Step 5: Solve for x
   x = 102,660,004,836/155,248
6. Step 6: Final answer
   x = 661,264.59