Finding the Third Proportional to 4,819.50 and 7,720.31

Step by Step Solution

1. Step 1: Write the proportion equation
   4,819.50 : 7,720.31 = 7,720.31 : x
2. Step 2: Convert to fraction form
   4,819.50/7,720.31 = 7,720.31/x
3. Step 3: Cross multiply
   4,819.50x = 7,720.31 × 7,720.31
4. Step 4: Simplify right side
   4,819.50x = 59,603,225.10
5. Step 5: Solve for x
   x = 59,603,225.10/4,819.50
6. Step 6: Final answer
   x = 12,367.10