Finding the Fourth Proportional to 709,086.48, 978,557.76 and 386,802

Step by Step Solution

1. Step 1: Write the proportion equation
   709,086.48 : 978,557.76 = 386,802 : x
2. Step 2: Convert to fraction form
   709,086.48/978,557.76 = 386,802/x
3. Step 3: Cross multiply
   709,086.48x = 978,557.76 × 386,802
4. Step 4: Simplify right side
   709,086.48x = 378,508,098,683.52
5. Step 5: Solve for x
   x = 378,508,098,683.52/709,086.48
6. Step 6: Final answer
   x = 533,796.81