Finding the Third Proportional to 290,149.50 and 443,810.50

Step by Step Solution

1. Step 1: Write the proportion equation
   290,149.50 : 443,810.50 = 443,810.50 : x
2. Step 2: Convert to fraction form
   290,149.50/443,810.50 = 443,810.50/x
3. Step 3: Cross multiply
   290,149.50x = 443,810.50 × 443,810.50
4. Step 4: Simplify right side
   290,149.50x = 196,967,759,910.25
5. Step 5: Solve for x
   x = 196,967,759,910.25/290,149.50
6. Step 6: Final answer
   x = 678,849.21