Finding the Third Proportional to 78,915.50 and 122,656

Step by Step Solution

1. Step 1: Write the proportion equation
   78,915.50 : 122,656 = 122,656 : x
2. Step 2: Convert to fraction form
   78,915.50/122,656 = 122,656/x
3. Step 3: Cross multiply
   78,915.50x = 122,656 × 122,656
4. Step 4: Simplify right side
   78,915.50x = 15,044,494,336
5. Step 5: Solve for x
   x = 15,044,494,336/78,915.50
6. Step 6: Final answer
   x = 190,640.55