Finding the Fourth Proportional to 78,578.91, 108,565.72 and 54,811.69

Step by Step Solution

1. Step 1: Write the proportion equation
   78,578.91 : 108,565.72 = 54,811.69 : x
2. Step 2: Convert to fraction form
   78,578.91/108,565.72 = 54,811.69/x
3. Step 3: Cross multiply
   78,578.91x = 108,565.72 × 54,811.69
4. Step 4: Simplify right side
   78,578.91x = 5,950,670,180.82
5. Step 5: Solve for x
   x = 5,950,670,180.82/78,578.91
6. Step 6: Final answer
   x = 75,728.59