Finding the Fourth Proportional to 11,155.72, 15,399.83 and 7,811.68

Step by Step Solution

1. Step 1: Write the proportion equation
   11,155.72 : 15,399.83 = 7,811.68 : x
2. Step 2: Convert to fraction form
   11,155.72/15,399.83 = 7,811.68/x
3. Step 3: Cross multiply
   11,155.72x = 15,399.83 × 7,811.68
4. Step 4: Simplify right side
   11,155.72x = 120,298,544.01
5. Step 5: Solve for x
   x = 120,298,544.01/11,155.72
6. Step 6: Final answer
   x = 10,783.58