Finding the Third Proportional to 4,661.25 and 9,987.38

Step by Step Solution

1. Step 1: Write the proportion equation
   4,661.25 : 9,987.38 = 9,987.38 : x
2. Step 2: Convert to fraction form
   4,661.25/9,987.38 = 9,987.38/x
3. Step 3: Cross multiply
   4,661.25x = 9,987.38 × 9,987.38
4. Step 4: Simplify right side
   4,661.25x = 99,747,659.39
5. Step 5: Solve for x
   x = 99,747,659.39/4,661.25
6. Step 6: Final answer
   x = 21,399.34