Finding the Third Proportional to 315,475.50 and 688,048.50

Step by Step Solution

1. Step 1: Write the proportion equation
   315,475.50 : 688,048.50 = 688,048.50 : x
2. Step 2: Convert to fraction form
   315,475.50/688,048.50 = 688,048.50/x
3. Step 3: Cross multiply
   315,475.50x = 688,048.50 × 688,048.50
4. Step 4: Simplify right side
   315,475.50x = 473,410,738,352.25
5. Step 5: Solve for x
   x = 473,410,738,352.25/315,475.50
6. Step 6: Final answer
   x = 1,500,626.00