Finding the Third Proportional to 9,903 and 21,216

Step by Step Solution

1. Step 1: Write the proportion equation
   9,903 : 21,216 = 21,216 : x
2. Step 2: Convert to fraction form
   9,903/21,216 = 21,216/x
3. Step 3: Cross multiply
   9,903x = 21,216 × 21,216
4. Step 4: Simplify right side
   9,903x = 450,118,656
5. Step 5: Solve for x
   x = 450,118,656/9,903
6. Step 6: Final answer
   x = 45,452.76