Finding the Third Proportional to 287,403.75 and 435,081.38

Step by Step Solution

1. Step 1: Write the proportion equation
   287,403.75 : 435,081.38 = 435,081.38 : x
2. Step 2: Convert to fraction form
   287,403.75/435,081.38 = 435,081.38/x
3. Step 3: Cross multiply
   287,403.75x = 435,081.38 × 435,081.38
4. Step 4: Simplify right side
   287,403.75x = 189,295,802,871.89
5. Step 5: Solve for x
   x = 189,295,802,871.89/287,403.75
6. Step 6: Final answer
   x = 658,640.69