Finding the Third Proportional to 199,392 and 428,016

Step by Step Solution

1. Step 1: Write the proportion equation
   199,392 : 428,016 = 428,016 : x
2. Step 2: Convert to fraction form
   199,392/428,016 = 428,016/x
3. Step 3: Cross multiply
   199,392x = 428,016 × 428,016
4. Step 4: Simplify right side
   199,392x = 183,197,696,256
5. Step 5: Solve for x
   x = 183,197,696,256/199,392
6. Step 6: Final answer
   x = 918,781.58