Finding the Third Proportional to 315,666 and 693,540

Step by Step Solution

1. Step 1: Write the proportion equation
   315,666 : 693,540 = 693,540 : x
2. Step 2: Convert to fraction form
   315,666/693,540 = 693,540/x
3. Step 3: Cross multiply
   315,666x = 693,540 × 693,540
4. Step 4: Simplify right side
   315,666x = 480,997,731,600
5. Step 5: Solve for x
   x = 480,997,731,600/315,666
6. Step 6: Final answer
   x = 1,523,755.27