Finding the Third Proportional to 4,575.38 and 9,989.86

Step by Step Solution

1. Step 1: Write the proportion equation
   4,575.38 : 9,989.86 = 9,989.86 : x
2. Step 2: Convert to fraction form
   4,575.38/9,989.86 = 9,989.86/x
3. Step 3: Cross multiply
   4,575.38x = 9,989.86 × 9,989.86
4. Step 4: Simplify right side
   4,575.38x = 99,797,290.33
5. Step 5: Solve for x
   x = 99,797,290.33/4,575.38
6. Step 6: Final answer
   x = 21,811.83