Finding the Third Proportional to 318,408 and 693,028.50

Step by Step Solution

1. Step 1: Write the proportion equation
   318,408 : 693,028.50 = 693,028.50 : x
2. Step 2: Convert to fraction form
   318,408/693,028.50 = 693,028.50/x
3. Step 3: Cross multiply
   318,408x = 693,028.50 × 693,028.50
4. Step 4: Simplify right side
   318,408x = 480,288,501,812.25
5. Step 5: Solve for x
   x = 480,288,501,812.25/318,408
6. Step 6: Final answer
   x = 1,508,405.89