Finding the Third Proportional to 200,275 and 428,980

Step by Step Solution

1. Step 1: Write the proportion equation
   200,275 : 428,980 = 428,980 : x
2. Step 2: Convert to fraction form
   200,275/428,980 = 428,980/x
3. Step 3: Cross multiply
   200,275x = 428,980 × 428,980
4. Step 4: Simplify right side
   200,275x = 184,023,840,400
5. Step 5: Solve for x
   x = 184,023,840,400/200,275
6. Step 6: Final answer
   x = 918,855.78