Finding the Fourth Proportional to 709,016.67, 978,456.20 and 386,738.33

Step by Step Solution

1. Step 1: Write the proportion equation
   709,016.67 : 978,456.20 = 386,738.33 : x
2. Step 2: Convert to fraction form
   709,016.67/978,456.20 = 386,738.33/x
3. Step 3: Cross multiply
   709,016.67x = 978,456.20 × 386,738.33
4. Step 4: Simplify right side
   709,016.67x = 378,406,509,940.17
5. Step 5: Solve for x
   x = 378,406,509,940.17/709,016.67
6. Step 6: Final answer
   x = 533,706.08