Finding the Third Proportional to 290,148.50 and 443,809

Step by Step Solution

1. Step 1: Write the proportion equation
   290,148.50 : 443,809 = 443,809 : x
2. Step 2: Convert to fraction form
   290,148.50/443,809 = 443,809/x
3. Step 3: Cross multiply
   290,148.50x = 443,809 × 443,809
4. Step 4: Simplify right side
   290,148.50x = 196,966,428,481
5. Step 5: Solve for x
   x = 196,966,428,481/290,148.50
6. Step 6: Final answer
   x = 678,846.96