Finding the Third Proportional to 287,407.50 and 435,087.38

Step by Step Solution

1. Step 1: Write the proportion equation
   287,407.50 : 435,087.38 = 435,087.38 : x
2. Step 2: Convert to fraction form
   287,407.50/435,087.38 = 435,087.38/x
3. Step 3: Cross multiply
   287,407.50x = 435,087.38 × 435,087.38
4. Step 4: Simplify right side
   287,407.50x = 189,301,023,884.39
5. Step 5: Solve for x
   x = 189,301,023,884.39/287,407.50
6. Step 6: Final answer
   x = 658,650.26