Finding the Third Proportional to 318,697.50 and 445,545

Step by Step Solution

1. Step 1: Write the proportion equation
   318,697.50 : 445,545 = 445,545 : x
2. Step 2: Convert to fraction form
   318,697.50/445,545 = 445,545/x
3. Step 3: Cross multiply
   318,697.50x = 445,545 × 445,545
4. Step 4: Simplify right side
   318,697.50x = 198,510,347,025
5. Step 5: Solve for x
   x = 198,510,347,025/318,697.50
6. Step 6: Final answer
   x = 622,880.15