Finding the Third Proportional to 139,039.50 and 324,057

Step by Step Solution

1. Step 1: Write the proportion equation
   139,039.50 : 324,057 = 324,057 : x
2. Step 2: Convert to fraction form
   139,039.50/324,057 = 324,057/x
3. Step 3: Cross multiply
   139,039.50x = 324,057 × 324,057
4. Step 4: Simplify right side
   139,039.50x = 105,012,939,249
5. Step 5: Solve for x
   x = 105,012,939,249/139,039.50
6. Step 6: Final answer
   x = 755,274.14