Finding the Fourth Proportional to 8,928.78, 12,321.72 and 4,949.86

Step by Step Solution

1. Step 1: Write the proportion equation
   8,928.78 : 12,321.72 = 4,949.86 : x
2. Step 2: Convert to fraction form
   8,928.78/12,321.72 = 4,949.86/x
3. Step 3: Cross multiply
   8,928.78x = 12,321.72 × 4,949.86
4. Step 4: Simplify right side
   8,928.78x = 60,990,781.26
5. Step 5: Solve for x
   x = 60,990,781.26/8,928.78
6. Step 6: Final answer
   x = 6,830.81