Finding the Third Proportional to 4,570.50 and 9,921.38

Step by Step Solution

1. Step 1: Write the proportion equation
   4,570.50 : 9,921.38 = 9,921.38 : x
2. Step 2: Convert to fraction form
   4,570.50/9,921.38 = 9,921.38/x
3. Step 3: Cross multiply
   4,570.50x = 9,921.38 × 9,921.38
4. Step 4: Simplify right side
   4,570.50x = 98,433,681.89
5. Step 5: Solve for x
   x = 98,433,681.89/4,570.50
6. Step 6: Final answer
   x = 21,536.74