Finding the Third Proportional to 428,178 and 602,436

Step by Step Solution

1. Step 1: Write the proportion equation
   428,178 : 602,436 = 602,436 : x
2. Step 2: Convert to fraction form
   428,178/602,436 = 602,436/x
3. Step 3: Cross multiply
   428,178x = 602,436 × 602,436
4. Step 4: Simplify right side
   428,178x = 362,929,134,096
5. Step 5: Solve for x
   x = 362,929,134,096/428,178
6. Step 6: Final answer
   x = 847,612.75