Finding the Third Proportional to 290,468 and 443,316

Step by Step Solution

1. Step 1: Write the proportion equation
   290,468 : 443,316 = 443,316 : x
2. Step 2: Convert to fraction form
   290,468/443,316 = 443,316/x
3. Step 3: Cross multiply
   290,468x = 443,316 × 443,316
4. Step 4: Simplify right side
   290,468x = 196,529,075,856
5. Step 5: Solve for x
   x = 196,529,075,856/290,468
6. Step 6: Final answer
   x = 676,594.58