Finding the Fourth Proportional to 8,160.01, 11,288.37 and 7,864.77

Step by Step Solution

1. Step 1: Write the proportion equation
   8,160.01 : 11,288.37 = 7,864.77 : x
2. Step 2: Convert to fraction form
   8,160.01/11,288.37 = 7,864.77/x
3. Step 3: Cross multiply
   8,160.01x = 11,288.37 × 7,864.77
4. Step 4: Simplify right side
   8,160.01x = 88,780,433.72
5. Step 5: Solve for x
   x = 88,780,433.72/8,160.01
6. Step 6: Final answer
   x = 10,879.94