Finding the Third Proportional to 287,613 and 435,442.50

Step by Step Solution

1. Step 1: Write the proportion equation
   287,613 : 435,442.50 = 435,442.50 : x
2. Step 2: Convert to fraction form
   287,613/435,442.50 = 435,442.50/x
3. Step 3: Cross multiply
   287,613x = 435,442.50 × 435,442.50
4. Step 4: Simplify right side
   287,613x = 189,610,170,806.25
5. Step 5: Solve for x
   x = 189,610,170,806.25/287,613
6. Step 6: Final answer
   x = 659,254.52