Finding the Third Proportional to 155,309 and 245,479

Step by Step Solution

1. Step 1: Write the proportion equation
   155,309 : 245,479 = 245,479 : x
2. Step 2: Convert to fraction form
   155,309/245,479 = 245,479/x
3. Step 3: Cross multiply
   155,309x = 245,479 × 245,479
4. Step 4: Simplify right side
   155,309x = 60,259,939,441
5. Step 5: Solve for x
   x = 60,259,939,441/155,309
6. Step 6: Final answer
   x = 388,000.31