Finding the Fourth Proportional to 11,831, 17,742.66 and 3,931.40

Step by Step Solution

1. Step 1: Write the proportion equation
   11,831 : 17,742.66 = 3,931.40 : x
2. Step 2: Convert to fraction form
   11,831/17,742.66 = 3,931.40/x
3. Step 3: Cross multiply
   11,831x = 17,742.66 × 3,931.40
4. Step 4: Simplify right side
   11,831x = 69,753,404.81
5. Step 5: Solve for x
   x = 69,753,404.81/11,831
6. Step 6: Final answer
   x = 5,895.82