Finding the Third Proportional to 21,509 and 28,902

Step by Step Solution

1. Step 1: Write the proportion equation
   21,509 : 28,902 = 28,902 : x
2. Step 2: Convert to fraction form
   21,509/28,902 = 28,902/x
3. Step 3: Cross multiply
   21,509x = 28,902 × 28,902
4. Step 4: Simplify right side
   21,509x = 835,325,604
5. Step 5: Solve for x
   x = 835,325,604/21,509
6. Step 6: Final answer
   x = 38,836.10