Finding the Third Proportional to 9,871.13 and 21,099

Step by Step Solution

1. Step 1: Write the proportion equation
   9,871.13 : 21,099 = 21,099 : x
2. Step 2: Convert to fraction form
   9,871.13/21,099 = 21,099/x
3. Step 3: Cross multiply
   9,871.13x = 21,099 × 21,099
4. Step 4: Simplify right side
   9,871.13x = 445,167,801
5. Step 5: Solve for x
   x = 445,167,801/9,871.13
6. Step 6: Final answer
   x = 45,097.98