Finding the Fourth Proportional to 713,086.72, 984,070.56 and 390,794.20

Step by Step Solution

1. Step 1: Write the proportion equation
   713,086.72 : 984,070.56 = 390,794.20 : x
2. Step 2: Convert to fraction form
   713,086.72/984,070.56 = 390,794.20/x
3. Step 3: Cross multiply
   713,086.72x = 984,070.56 × 390,794.20
4. Step 4: Simplify right side
   713,086.72x = 384,569,067,238.75
5. Step 5: Solve for x
   x = 384,569,067,238.75/713,086.72
6. Step 6: Final answer
   x = 539,301.96