Finding the Fourth Proportional to 8,978.14, 12,391.89 and 5,828.86

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.14 : 12,391.89 = 5,828.86 : x
2. Step 2: Convert to fraction form
   8,978.14/12,391.89 = 5,828.86/x
3. Step 3: Cross multiply
   8,978.14x = 12,391.89 × 5,828.86
4. Step 4: Simplify right side
   8,978.14x = 72,230,591.95
5. Step 5: Solve for x
   x = 72,230,591.95/8,978.14
6. Step 6: Final answer
   x = 8,045.16