Finding the Third Proportional to 290,172 and 443,598

Step by Step Solution

1. Step 1: Write the proportion equation
   290,172 : 443,598 = 443,598 : x
2. Step 2: Convert to fraction form
   290,172/443,598 = 443,598/x
3. Step 3: Cross multiply
   290,172x = 443,598 × 443,598
4. Step 4: Simplify right side
   290,172x = 196,779,185,604
5. Step 5: Solve for x
   x = 196,779,185,604/290,172
6. Step 6: Final answer
   x = 678,146.70