Finding the Fourth Proportional to 564,479.20, 778,978.56 and 309,834.72

Step by Step Solution

1. Step 1: Write the proportion equation
   564,479.20 : 778,978.56 = 309,834.72 : x
2. Step 2: Convert to fraction form
   564,479.20/778,978.56 = 309,834.72/x
3. Step 3: Cross multiply
   564,479.20x = 778,978.56 × 309,834.72
4. Step 4: Simplify right side
   564,479.20x = 241,354,604,023.60
5. Step 5: Solve for x
   x = 241,354,604,023.60/564,479.20
6. Step 6: Final answer
   x = 427,570.41