Finding the Fourth Proportional to 20,651.74, 30,978.78 and 5,859.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,651.74 : 30,978.78 = 5,859.50 : x
2. Step 2: Convert to fraction form
   20,651.74/30,978.78 = 5,859.50/x
3. Step 3: Cross multiply
   20,651.74x = 30,978.78 × 5,859.50
4. Step 4: Simplify right side
   20,651.74x = 181,520,161.41
5. Step 5: Solve for x
   x = 181,520,161.41/20,651.74
6. Step 6: Final answer
   x = 8,789.58