Finding the Fourth Proportional to 5,978.07, 8,960.18 and 5,286.09

Step by Step Solution

1. Step 1: Write the proportion equation
   5,978.07 : 8,960.18 = 5,286.09 : x
2. Step 2: Convert to fraction form
   5,978.07/8,960.18 = 5,286.09/x
3. Step 3: Cross multiply
   5,978.07x = 8,960.18 × 5,286.09
4. Step 4: Simplify right side
   5,978.07x = 47,364,317.90
5. Step 5: Solve for x
   x = 47,364,317.90/5,978.07
6. Step 6: Final answer
   x = 7,923.01