Finding the Third Proportional to 19,640 and 42,393

Step by Step Solution

1. Step 1: Write the proportion equation
   19,640 : 42,393 = 42,393 : x
2. Step 2: Convert to fraction form
   19,640/42,393 = 42,393/x
3. Step 3: Cross multiply
   19,640x = 42,393 × 42,393
4. Step 4: Simplify right side
   19,640x = 1,797,166,449
5. Step 5: Solve for x
   x = 1,797,166,449/19,640
6. Step 6: Final answer
   x = 91,505.42