Finding the Third Proportional to 290,306 and 448,404

Step by Step Solution

1. Step 1: Write the proportion equation
   290,306 : 448,404 = 448,404 : x
2. Step 2: Convert to fraction form
   290,306/448,404 = 448,404/x
3. Step 3: Cross multiply
   290,306x = 448,404 × 448,404
4. Step 4: Simplify right side
   290,306x = 201,066,147,216
5. Step 5: Solve for x
   x = 201,066,147,216/290,306
6. Step 6: Final answer
   x = 692,600.73