Finding the Third Proportional to 199,792 and 309,336

Step by Step Solution

1. Step 1: Write the proportion equation
   199,792 : 309,336 = 309,336 : x
2. Step 2: Convert to fraction form
   199,792/309,336 = 309,336/x
3. Step 3: Cross multiply
   199,792x = 309,336 × 309,336
4. Step 4: Simplify right side
   199,792x = 95,688,760,896
5. Step 5: Solve for x
   x = 95,688,760,896/199,792
6. Step 6: Final answer
   x = 478,941.90