Finding the Third Proportional to 315,017.25 and 691,284

Step by Step Solution

1. Step 1: Write the proportion equation
   315,017.25 : 691,284 = 691,284 : x
2. Step 2: Convert to fraction form
   315,017.25/691,284 = 691,284/x
3. Step 3: Cross multiply
   315,017.25x = 691,284 × 691,284
4. Step 4: Simplify right side
   315,017.25x = 477,873,568,656
5. Step 5: Solve for x
   x = 477,873,568,656/315,017.25
6. Step 6: Final answer
   x = 1,516,975.88