Finding the Third Proportional to 21,136 and 28,760

Step by Step Solution

1. Step 1: Write the proportion equation
   21,136 : 28,760 = 28,760 : x
2. Step 2: Convert to fraction form
   21,136/28,760 = 28,760/x
3. Step 3: Cross multiply
   21,136x = 28,760 × 28,760
4. Step 4: Simplify right side
   21,136x = 827,137,600
5. Step 5: Solve for x
   x = 827,137,600/21,136
6. Step 6: Final answer
   x = 39,134.07