Finding the Third Proportional to 4,379.91 and 9,503.16

Step by Step Solution

1. Step 1: Write the proportion equation
   4,379.91 : 9,503.16 = 9,503.16 : x
2. Step 2: Convert to fraction form
   4,379.91/9,503.16 = 9,503.16/x
3. Step 3: Cross multiply
   4,379.91x = 9,503.16 × 9,503.16
4. Step 4: Simplify right side
   4,379.91x = 90,309,978.71
5. Step 5: Solve for x
   x = 90,309,978.71/4,379.91
6. Step 6: Final answer
   x = 20,619.16