Finding the Third Proportional to 345,574.50 and 718,728

Step by Step Solution

1. Step 1: Write the proportion equation
   345,574.50 : 718,728 = 718,728 : x
2. Step 2: Convert to fraction form
   345,574.50/718,728 = 718,728/x
3. Step 3: Cross multiply
   345,574.50x = 718,728 × 718,728
4. Step 4: Simplify right side
   345,574.50x = 516,569,937,984
5. Step 5: Solve for x
   x = 516,569,937,984/345,574.50
6. Step 6: Final answer
   x = 1,494,814.98