Finding the Third Proportional to 289,772.50 and 443,265

Step by Step Solution

1. Step 1: Write the proportion equation
   289,772.50 : 443,265 = 443,265 : x
2. Step 2: Convert to fraction form
   289,772.50/443,265 = 443,265/x
3. Step 3: Cross multiply
   289,772.50x = 443,265 × 443,265
4. Step 4: Simplify right side
   289,772.50x = 196,483,860,225
5. Step 5: Solve for x
   x = 196,483,860,225/289,772.50
6. Step 6: Final answer
   x = 678,062.48