Finding the Third Proportional to 316,440 and 682,357.50

Step by Step Solution

1. Step 1: Write the proportion equation
   316,440 : 682,357.50 = 682,357.50 : x
2. Step 2: Convert to fraction form
   316,440/682,357.50 = 682,357.50/x
3. Step 3: Cross multiply
   316,440x = 682,357.50 × 682,357.50
4. Step 4: Simplify right side
   316,440x = 465,611,757,806.25
5. Step 5: Solve for x
   x = 465,611,757,806.25/316,440
6. Step 6: Final answer
   x = 1,471,406.14