Finding the Fourth Proportional to 709,320.16, 978,859.74 and 387,028

Step by Step Solution

1. Step 1: Write the proportion equation
   709,320.16 : 978,859.74 = 387,028 : x
2. Step 2: Convert to fraction form
   709,320.16/978,859.74 = 387,028/x
3. Step 3: Cross multiply
   709,320.16x = 978,859.74 × 387,028
4. Step 4: Simplify right side
   709,320.16x = 378,846,127,452.72
5. Step 5: Solve for x
   x = 378,846,127,452.72/709,320.16
6. Step 6: Final answer
   x = 534,097.50