Finding the Third Proportional to 279,776 and 422,002

Step by Step Solution

1. Step 1: Write the proportion equation
   279,776 : 422,002 = 422,002 : x
2. Step 2: Convert to fraction form
   279,776/422,002 = 422,002/x
3. Step 3: Cross multiply
   279,776x = 422,002 × 422,002
4. Step 4: Simplify right side
   279,776x = 178,085,688,004
5. Step 5: Solve for x
   x = 178,085,688,004/279,776
6. Step 6: Final answer
   x = 636,529.54