Finding the Third Proportional to 315,484.50 and 688,066.50

Step by Step Solution

1. Step 1: Write the proportion equation
   315,484.50 : 688,066.50 = 688,066.50 : x
2. Step 2: Convert to fraction form
   315,484.50/688,066.50 = 688,066.50/x
3. Step 3: Cross multiply
   315,484.50x = 688,066.50 × 688,066.50
4. Step 4: Simplify right side
   315,484.50x = 473,435,508,422.25
5. Step 5: Solve for x
   x = 473,435,508,422.25/315,484.50
6. Step 6: Final answer
   x = 1,500,661.71