Finding the Fourth Proportional to 8,382.12, 12,575.20 and 3,117.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,382.12 : 12,575.20 = 3,117.31 : x
2. Step 2: Convert to fraction form
   8,382.12/12,575.20 = 3,117.31/x
3. Step 3: Cross multiply
   8,382.12x = 12,575.20 × 3,117.31
4. Step 4: Simplify right side
   8,382.12x = 39,200,796.71
5. Step 5: Solve for x
   x = 39,200,796.71/8,382.12
6. Step 6: Final answer
   x = 4,676.72