Finding the Third Proportional to 53,321 and 123,439

Step by Step Solution

1. Step 1: Write the proportion equation
   53,321 : 123,439 = 123,439 : x
2. Step 2: Convert to fraction form
   53,321/123,439 = 123,439/x
3. Step 3: Cross multiply
   53,321x = 123,439 × 123,439
4. Step 4: Simplify right side
   53,321x = 15,237,186,721
5. Step 5: Solve for x
   x = 15,237,186,721/53,321
6. Step 6: Final answer
   x = 285,763.33