Finding the Fourth Proportional to 8,316.40, 12,479.58 and 3,317.89

Step by Step Solution

1. Step 1: Write the proportion equation
   8,316.40 : 12,479.58 = 3,317.89 : x
2. Step 2: Convert to fraction form
   8,316.40/12,479.58 = 3,317.89/x
3. Step 3: Cross multiply
   8,316.40x = 12,479.58 × 3,317.89
4. Step 4: Simplify right side
   8,316.40x = 41,405,873.69
5. Step 5: Solve for x
   x = 41,405,873.69/8,316.40
6. Step 6: Final answer
   x = 4,978.82