Finding the Third Proportional to 21,578 and 28,998

Step by Step Solution

1. Step 1: Write the proportion equation
   21,578 : 28,998 = 28,998 : x
2. Step 2: Convert to fraction form
   21,578/28,998 = 28,998/x
3. Step 3: Cross multiply
   21,578x = 28,998 × 28,998
4. Step 4: Simplify right side
   21,578x = 840,884,004
5. Step 5: Solve for x
   x = 840,884,004/21,578
6. Step 6: Final answer
   x = 38,969.51