Finding the Third Proportional to 21,565 and 28,978

Step by Step Solution

1. Step 1: Write the proportion equation
   21,565 : 28,978 = 28,978 : x
2. Step 2: Convert to fraction form
   21,565/28,978 = 28,978/x
3. Step 3: Cross multiply
   21,565x = 28,978 × 28,978
4. Step 4: Simplify right side
   21,565x = 839,724,484
5. Step 5: Solve for x
   x = 839,724,484/21,565
6. Step 6: Final answer
   x = 38,939.23