Finding the Third Proportional to 336,384 and 521,390

Step by Step Solution

1. Step 1: Write the proportion equation
   336,384 : 521,390 = 521,390 : x
2. Step 2: Convert to fraction form
   336,384/521,390 = 521,390/x
3. Step 3: Cross multiply
   336,384x = 521,390 × 521,390
4. Step 4: Simplify right side
   336,384x = 271,847,532,100
5. Step 5: Solve for x
   x = 271,847,532,100/336,384
6. Step 6: Final answer
   x = 808,146.44