Finding the Third Proportional to 290,187 and 443,866.50

Step by Step Solution

1. Step 1: Write the proportion equation
   290,187 : 443,866.50 = 443,866.50 : x
2. Step 2: Convert to fraction form
   290,187/443,866.50 = 443,866.50/x
3. Step 3: Cross multiply
   290,187x = 443,866.50 × 443,866.50
4. Step 4: Simplify right side
   290,187x = 197,017,469,822.25
5. Step 5: Solve for x
   x = 197,017,469,822.25/290,187
6. Step 6: Final answer
   x = 678,932.79