Finding the Third Proportional to 431,658 and 670,252.50

Step by Step Solution

1. Step 1: Write the proportion equation
   431,658 : 670,252.50 = 670,252.50 : x
2. Step 2: Convert to fraction form
   431,658/670,252.50 = 670,252.50/x
3. Step 3: Cross multiply
   431,658x = 670,252.50 × 670,252.50
4. Step 4: Simplify right side
   431,658x = 449,238,413,756.25
5. Step 5: Solve for x
   x = 449,238,413,756.25/431,658
6. Step 6: Final answer
   x = 1,040,727.64