Finding the Fourth Proportional to 8,624.16, 12,920.76 and 5,240.79

Step by Step Solution

1. Step 1: Write the proportion equation
   8,624.16 : 12,920.76 = 5,240.79 : x
2. Step 2: Convert to fraction form
   8,624.16/12,920.76 = 5,240.79/x
3. Step 3: Cross multiply
   8,624.16x = 12,920.76 × 5,240.79
4. Step 4: Simplify right side
   8,624.16x = 67,714,989.80
5. Step 5: Solve for x
   x = 67,714,989.80/8,624.16
6. Step 6: Final answer
   x = 7,851.78