Finding the Third Proportional to 129,361.50 and 278,396

Step by Step Solution

1. Step 1: Write the proportion equation
   129,361.50 : 278,396 = 278,396 : x
2. Step 2: Convert to fraction form
   129,361.50/278,396 = 278,396/x
3. Step 3: Cross multiply
   129,361.50x = 278,396 × 278,396
4. Step 4: Simplify right side
   129,361.50x = 77,504,332,816
5. Step 5: Solve for x
   x = 77,504,332,816/129,361.50
6. Step 6: Final answer
   x = 599,129.82