Finding the Third Proportional to 128,392 and 282,404

Step by Step Solution

1. Step 1: Write the proportion equation
   128,392 : 282,404 = 282,404 : x
2. Step 2: Convert to fraction form
   128,392/282,404 = 282,404/x
3. Step 3: Cross multiply
   128,392x = 282,404 × 282,404
4. Step 4: Simplify right side
   128,392x = 79,752,019,216
5. Step 5: Solve for x
   x = 79,752,019,216/128,392
6. Step 6: Final answer
   x = 621,160.35