Finding the Third Proportional to 287,772 and 435,672

Step by Step Solution

1. Step 1: Write the proportion equation
   287,772 : 435,672 = 435,672 : x
2. Step 2: Convert to fraction form
   287,772/435,672 = 435,672/x
3. Step 3: Cross multiply
   287,772x = 435,672 × 435,672
4. Step 4: Simplify right side
   287,772x = 189,810,091,584
5. Step 5: Solve for x
   x = 189,810,091,584/287,772
6. Step 6: Final answer
   x = 659,584.99