Finding the Third Proportional to 423,007.50 and 655,315.50

Step by Step Solution

1. Step 1: Write the proportion equation
   423,007.50 : 655,315.50 = 655,315.50 : x
2. Step 2: Convert to fraction form
   423,007.50/655,315.50 = 655,315.50/x
3. Step 3: Cross multiply
   423,007.50x = 655,315.50 × 655,315.50
4. Step 4: Simplify right side
   423,007.50x = 429,438,404,540.25
5. Step 5: Solve for x
   x = 429,438,404,540.25/423,007.50
6. Step 6: Final answer
   x = 1,015,202.81