Finding the Third Proportional to 189,132 and 287,628

Step by Step Solution

1. Step 1: Write the proportion equation
   189,132 : 287,628 = 287,628 : x
2. Step 2: Convert to fraction form
   189,132/287,628 = 287,628/x
3. Step 3: Cross multiply
   189,132x = 287,628 × 287,628
4. Step 4: Simplify right side
   189,132x = 82,729,866,384
5. Step 5: Solve for x
   x = 82,729,866,384/189,132
6. Step 6: Final answer
   x = 437,418.66