Finding the Fourth Proportional to 8,976.60, 13,456.38 and 3,131.64

Step by Step Solution

1. Step 1: Write the proportion equation
   8,976.60 : 13,456.38 = 3,131.64 : x
2. Step 2: Convert to fraction form
   8,976.60/13,456.38 = 3,131.64/x
3. Step 3: Cross multiply
   8,976.60x = 13,456.38 × 3,131.64
4. Step 4: Simplify right side
   8,976.60x = 42,140,537.86
5. Step 5: Solve for x
   x = 42,140,537.86/8,976.60
6. Step 6: Final answer
   x = 4,694.49