Finding the Third Proportional to 318,968 and 495,300

Step by Step Solution

1. Step 1: Write the proportion equation
   318,968 : 495,300 = 495,300 : x
2. Step 2: Convert to fraction form
   318,968/495,300 = 495,300/x
3. Step 3: Cross multiply
   318,968x = 495,300 × 495,300
4. Step 4: Simplify right side
   318,968x = 245,322,090,000
5. Step 5: Solve for x
   x = 245,322,090,000/318,968
6. Step 6: Final answer
   x = 769,111.92