Finding the Fourth Proportional to 3,931.90, 5,424.56 and 2,338.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,931.90 : 5,424.56 = 2,338.61 : x
2. Step 2: Convert to fraction form
   3,931.90/5,424.56 = 2,338.61/x
3. Step 3: Cross multiply
   3,931.90x = 5,424.56 × 2,338.61
4. Step 4: Simplify right side
   3,931.90x = 12,685,919.81
5. Step 5: Solve for x
   x = 12,685,919.81/3,931.90
6. Step 6: Final answer
   x = 3,226.41