Finding the Third Proportional to 315,522 and 688,864.50

Step by Step Solution

1. Step 1: Write the proportion equation
   315,522 : 688,864.50 = 688,864.50 : x
2. Step 2: Convert to fraction form
   315,522/688,864.50 = 688,864.50/x
3. Step 3: Cross multiply
   315,522x = 688,864.50 × 688,864.50
4. Step 4: Simplify right side
   315,522x = 474,534,299,360.25
5. Step 5: Solve for x
   x = 474,534,299,360.25/315,522
6. Step 6: Final answer
   x = 1,503,965.81