Finding the Third Proportional to 148,542 and 309,320

Step by Step Solution

1. Step 1: Write the proportion equation
   148,542 : 309,320 = 309,320 : x
2. Step 2: Convert to fraction form
   148,542/309,320 = 309,320/x
3. Step 3: Cross multiply
   148,542x = 309,320 × 309,320
4. Step 4: Simplify right side
   148,542x = 95,678,862,400
5. Step 5: Solve for x
   x = 95,678,862,400/148,542
6. Step 6: Final answer
   x = 644,119.93