Finding the Third Proportional to 368,488 and 521,488

Step by Step Solution

1. Step 1: Write the proportion equation
   368,488 : 521,488 = 521,488 : x
2. Step 2: Convert to fraction form
   368,488/521,488 = 521,488/x
3. Step 3: Cross multiply
   368,488x = 521,488 × 521,488
4. Step 4: Simplify right side
   368,488x = 271,949,734,144
5. Step 5: Solve for x
   x = 271,949,734,144/368,488
6. Step 6: Final answer
   x = 738,015.17