Finding the Third Proportional to 272,892 and 421,002

Step by Step Solution

1. Step 1: Write the proportion equation
   272,892 : 421,002 = 421,002 : x
2. Step 2: Convert to fraction form
   272,892/421,002 = 421,002/x
3. Step 3: Cross multiply
   272,892x = 421,002 × 421,002
4. Step 4: Simplify right side
   272,892x = 177,242,684,004
5. Step 5: Solve for x
   x = 177,242,684,004/272,892
6. Step 6: Final answer
   x = 649,497.54