Finding the Third Proportional to 287,713.50 and 435,568.50

Step by Step Solution

1. Step 1: Write the proportion equation
   287,713.50 : 435,568.50 = 435,568.50 : x
2. Step 2: Convert to fraction form
   287,713.50/435,568.50 = 435,568.50/x
3. Step 3: Cross multiply
   287,713.50x = 435,568.50 × 435,568.50
4. Step 4: Simplify right side
   287,713.50x = 189,719,918,192.25
5. Step 5: Solve for x
   x = 189,719,918,192.25/287,713.50
6. Step 6: Final answer
   x = 659,405.69