Finding the Third Proportional to 315,549 and 688,932

Step by Step Solution

1. Step 1: Write the proportion equation
   315,549 : 688,932 = 688,932 : x
2. Step 2: Convert to fraction form
   315,549/688,932 = 688,932/x
3. Step 3: Cross multiply
   315,549x = 688,932 × 688,932
4. Step 4: Simplify right side
   315,549x = 474,627,300,624
5. Step 5: Solve for x
   x = 474,627,300,624/315,549
6. Step 6: Final answer
   x = 1,504,131.85