Finding the Third Proportional to 21,879 and 52,915.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,879 : 52,915.50 = 52,915.50 : x
2. Step 2: Convert to fraction form
   21,879/52,915.50 = 52,915.50/x
3. Step 3: Cross multiply
   21,879x = 52,915.50 × 52,915.50
4. Step 4: Simplify right side
   21,879x = 2,800,050,140.25
5. Step 5: Solve for x
   x = 2,800,050,140.25/21,879
6. Step 6: Final answer
   x = 127,978.89