Finding the Third Proportional to 21,240 and 28,976

Step by Step Solution

1. Step 1: Write the proportion equation
   21,240 : 28,976 = 28,976 : x
2. Step 2: Convert to fraction form
   21,240/28,976 = 28,976/x
3. Step 3: Cross multiply
   21,240x = 28,976 × 28,976
4. Step 4: Simplify right side
   21,240x = 839,608,576
5. Step 5: Solve for x
   x = 839,608,576/21,240
6. Step 6: Final answer
   x = 39,529.59