Finding the Third Proportional to 10,020 and 21,430

Step by Step Solution

1. Step 1: Write the proportion equation
   10,020 : 21,430 = 21,430 : x
2. Step 2: Convert to fraction form
   10,020/21,430 = 21,430/x
3. Step 3: Cross multiply
   10,020x = 21,430 × 21,430
4. Step 4: Simplify right side
   10,020x = 459,244,900
5. Step 5: Solve for x
   x = 459,244,900/10,020
6. Step 6: Final answer
   x = 45,832.82