Finding the Third Proportional to 19,878 and 42,540

Step by Step Solution

1. Step 1: Write the proportion equation
   19,878 : 42,540 = 42,540 : x
2. Step 2: Convert to fraction form
   19,878/42,540 = 42,540/x
3. Step 3: Cross multiply
   19,878x = 42,540 × 42,540
4. Step 4: Simplify right side
   19,878x = 1,809,651,600
5. Step 5: Solve for x
   x = 1,809,651,600/19,878
6. Step 6: Final answer
   x = 91,037.91