Finding the Fourth Proportional to 5,450.18, 8,105.61 and 5,391.86

Step by Step Solution

1. Step 1: Write the proportion equation
   5,450.18 : 8,105.61 = 5,391.86 : x
2. Step 2: Convert to fraction form
   5,450.18/8,105.61 = 5,391.86/x
3. Step 3: Cross multiply
   5,450.18x = 8,105.61 × 5,391.86
4. Step 4: Simplify right side
   5,450.18x = 43,704,287.38
5. Step 5: Solve for x
   x = 43,704,287.38/5,450.18
6. Step 6: Final answer
   x = 8,018.87