Finding the Third Proportional to 200,448 and 309,312

Step by Step Solution

1. Step 1: Write the proportion equation
   200,448 : 309,312 = 309,312 : x
2. Step 2: Convert to fraction form
   200,448/309,312 = 309,312/x
3. Step 3: Cross multiply
   200,448x = 309,312 × 309,312
4. Step 4: Simplify right side
   200,448x = 95,673,913,344
5. Step 5: Solve for x
   x = 95,673,913,344/200,448
6. Step 6: Final answer
   x = 477,300.41