Finding the Third Proportional to 315,852 and 690,754.50

Step by Step Solution

1. Step 1: Write the proportion equation
   315,852 : 690,754.50 = 690,754.50 : x
2. Step 2: Convert to fraction form
   315,852/690,754.50 = 690,754.50/x
3. Step 3: Cross multiply
   315,852x = 690,754.50 × 690,754.50
4. Step 4: Simplify right side
   315,852x = 477,141,779,270.25
5. Step 5: Solve for x
   x = 477,141,779,270.25/315,852
6. Step 6: Final answer
   x = 1,510,649.86