Finding the Third Proportional to 318,496.50 and 693,189

Step by Step Solution

1. Step 1: Write the proportion equation
   318,496.50 : 693,189 = 693,189 : x
2. Step 2: Convert to fraction form
   318,496.50/693,189 = 693,189/x
3. Step 3: Cross multiply
   318,496.50x = 693,189 × 693,189
4. Step 4: Simplify right side
   318,496.50x = 480,510,989,721
5. Step 5: Solve for x
   x = 480,510,989,721/318,496.50
6. Step 6: Final answer
   x = 1,508,685.31