Finding the Third Proportional to 290,148 and 443,808

Step by Step Solution

1. Step 1: Write the proportion equation
   290,148 : 443,808 = 443,808 : x
2. Step 2: Convert to fraction form
   290,148/443,808 = 443,808/x
3. Step 3: Cross multiply
   290,148x = 443,808 × 443,808
4. Step 4: Simplify right side
   290,148x = 196,965,540,864
5. Step 5: Solve for x
   x = 196,965,540,864/290,148
6. Step 6: Final answer
   x = 678,845.08