Finding the Third Proportional to 289,818 and 443,371.50

Step by Step Solution

1. Step 1: Write the proportion equation
   289,818 : 443,371.50 = 443,371.50 : x
2. Step 2: Convert to fraction form
   289,818/443,371.50 = 443,371.50/x
3. Step 3: Cross multiply
   289,818x = 443,371.50 × 443,371.50
4. Step 4: Simplify right side
   289,818x = 196,578,287,012.25
5. Step 5: Solve for x
   x = 196,578,287,012.25/289,818
6. Step 6: Final answer
   x = 678,281.84