Finding the Third Proportional to 152,990 and 331,396

Step by Step Solution

1. Step 1: Write the proportion equation
   152,990 : 331,396 = 331,396 : x
2. Step 2: Convert to fraction form
   152,990/331,396 = 331,396/x
3. Step 3: Cross multiply
   152,990x = 331,396 × 331,396
4. Step 4: Simplify right side
   152,990x = 109,823,308,816
5. Step 5: Solve for x
   x = 109,823,308,816/152,990
6. Step 6: Final answer
   x = 717,846.32