Finding the Fourth Proportional to 8,919.10, 12,308.34 and 4,940.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,919.10 : 12,308.34 = 4,940.20 : x
2. Step 2: Convert to fraction form
   8,919.10/12,308.34 = 4,940.20/x
3. Step 3: Cross multiply
   8,919.10x = 12,308.34 × 4,940.20
4. Step 4: Simplify right side
   8,919.10x = 60,805,661.27
5. Step 5: Solve for x
   x = 60,805,661.27/8,919.10
6. Step 6: Final answer
   x = 6,817.47