Finding the Fourth Proportional to 8,920.16, 12,308.64 and 4,940.76

Step by Step Solution

1. Step 1: Write the proportion equation
   8,920.16 : 12,308.64 = 4,940.76 : x
2. Step 2: Convert to fraction form
   8,920.16/12,308.64 = 4,940.76/x
3. Step 3: Cross multiply
   8,920.16x = 12,308.64 × 4,940.76
4. Step 4: Simplify right side
   8,920.16x = 60,814,091.59
5. Step 5: Solve for x
   x = 60,814,091.59/8,920.16
6. Step 6: Final answer
   x = 6,817.60