Finding the Third Proportional to 280,532 and 423,710

Step by Step Solution

1. Step 1: Write the proportion equation
   280,532 : 423,710 = 423,710 : x
2. Step 2: Convert to fraction form
   280,532/423,710 = 423,710/x
3. Step 3: Cross multiply
   280,532x = 423,710 × 423,710
4. Step 4: Simplify right side
   280,532x = 179,530,164,100
5. Step 5: Solve for x
   x = 179,530,164,100/280,532
6. Step 6: Final answer
   x = 639,963.23