Finding the Fourth Proportional to 8,247.89, 12,355.38 and 4,959.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,247.89 : 12,355.38 = 4,959.20 : x
2. Step 2: Convert to fraction form
   8,247.89/12,355.38 = 4,959.20/x
3. Step 3: Cross multiply
   8,247.89x = 12,355.38 × 4,959.20
4. Step 4: Simplify right side
   8,247.89x = 61,272,738.72
5. Step 5: Solve for x
   x = 61,272,738.72/8,247.89
6. Step 6: Final answer
   x = 7,428.90