Finding the Third Proportional to 315,492 and 488,790

Step by Step Solution

1. Step 1: Write the proportion equation
   315,492 : 488,790 = 488,790 : x
2. Step 2: Convert to fraction form
   315,492/488,790 = 488,790/x
3. Step 3: Cross multiply
   315,492x = 488,790 × 488,790
4. Step 4: Simplify right side
   315,492x = 238,915,664,100
5. Step 5: Solve for x
   x = 238,915,664,100/315,492
6. Step 6: Final answer
   x = 757,279.63