Finding the Fourth Proportional to 10,860.76, 16,285.67 and 5,305.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,860.76 : 16,285.67 = 5,305.78 : x
2. Step 2: Convert to fraction form
   10,860.76/16,285.67 = 5,305.78/x
3. Step 3: Cross multiply
   10,860.76x = 16,285.67 × 5,305.78
4. Step 4: Simplify right side
   10,860.76x = 86,408,074.22
5. Step 5: Solve for x
   x = 86,408,074.22/10,860.76
6. Step 6: Final answer
   x = 7,955.99