Finding the Third Proportional to 315,436 and 488,706

Step by Step Solution

1. Step 1: Write the proportion equation
   315,436 : 488,706 = 488,706 : x
2. Step 2: Convert to fraction form
   315,436/488,706 = 488,706/x
3. Step 3: Cross multiply
   315,436x = 488,706 × 488,706
4. Step 4: Simplify right side
   315,436x = 238,833,554,436
5. Step 5: Solve for x
   x = 238,833,554,436/315,436
6. Step 6: Final answer
   x = 757,153.76