Finding the Third Proportional to 430,987 and 682,111.50

Step by Step Solution

1. Step 1: Write the proportion equation
   430,987 : 682,111.50 = 682,111.50 : x
2. Step 2: Convert to fraction form
   430,987/682,111.50 = 682,111.50/x
3. Step 3: Cross multiply
   430,987x = 682,111.50 × 682,111.50
4. Step 4: Simplify right side
   430,987x = 465,276,098,432.25
5. Step 5: Solve for x
   x = 465,276,098,432.25/430,987
6. Step 6: Final answer
   x = 1,079,559.47