Finding the Fourth Proportional to 6,831.38, 10,245.45 and 3,131.30

Step by Step Solution

1. Step 1: Write the proportion equation
   6,831.38 : 10,245.45 = 3,131.30 : x
2. Step 2: Convert to fraction form
   6,831.38/10,245.45 = 3,131.30/x
3. Step 3: Cross multiply
   6,831.38x = 10,245.45 × 3,131.30
4. Step 4: Simplify right side
   6,831.38x = 32,081,577.59
5. Step 5: Solve for x
   x = 32,081,577.59/6,831.38
6. Step 6: Final answer
   x = 4,696.21