Finding the Third Proportional to 289,755 and 443,243.50

Step by Step Solution

1. Step 1: Write the proportion equation
   289,755 : 443,243.50 = 443,243.50 : x
2. Step 2: Convert to fraction form
   289,755/443,243.50 = 443,243.50/x
3. Step 3: Cross multiply
   289,755x = 443,243.50 × 443,243.50
4. Step 4: Simplify right side
   289,755x = 196,464,800,292.25
5. Step 5: Solve for x
   x = 196,464,800,292.25/289,755
6. Step 6: Final answer
   x = 678,037.65