Finding the Fourth Proportional to 417,978.72, 576,987.24 and 282,196.62

Step by Step Solution

1. Step 1: Write the proportion equation
   417,978.72 : 576,987.24 = 282,196.62 : x
2. Step 2: Convert to fraction form
   417,978.72/576,987.24 = 282,196.62/x
3. Step 3: Cross multiply
   417,978.72x = 576,987.24 × 282,196.62
4. Step 4: Simplify right side
   417,978.72x = 162,823,848,911.13
5. Step 5: Solve for x
   x = 162,823,848,911.13/417,978.72
6. Step 6: Final answer
   x = 389,550.57