Finding the Third Proportional to 28,578 and 42,839

Step by Step Solution

1. Step 1: Write the proportion equation
   28,578 : 42,839 = 42,839 : x
2. Step 2: Convert to fraction form
   28,578/42,839 = 42,839/x
3. Step 3: Cross multiply
   28,578x = 42,839 × 42,839
4. Step 4: Simplify right side
   28,578x = 1,835,179,921
5. Step 5: Solve for x
   x = 1,835,179,921/28,578
6. Step 6: Final answer
   x = 64,216.53