Finding the Third Proportional to 393,978 and 602,404

Step by Step Solution

1. Step 1: Write the proportion equation
   393,978 : 602,404 = 602,404 : x
2. Step 2: Convert to fraction form
   393,978/602,404 = 602,404/x
3. Step 3: Cross multiply
   393,978x = 602,404 × 602,404
4. Step 4: Simplify right side
   393,978x = 362,890,579,216
5. Step 5: Solve for x
   x = 362,890,579,216/393,978
6. Step 6: Final answer
   x = 921,093.51