Finding the Third Proportional to 315,019 and 691,273.50

Step by Step Solution

1. Step 1: Write the proportion equation
   315,019 : 691,273.50 = 691,273.50 : x
2. Step 2: Convert to fraction form
   315,019/691,273.50 = 691,273.50/x
3. Step 3: Cross multiply
   315,019x = 691,273.50 × 691,273.50
4. Step 4: Simplify right side
   315,019x = 477,859,051,802.25
5. Step 5: Solve for x
   x = 477,859,051,802.25/315,019
6. Step 6: Final answer
   x = 1,516,921.37