Finding the Fourth Proportional to 10,931.78, 16,397.76 and 3,140.59

Step by Step Solution

1. Step 1: Write the proportion equation
   10,931.78 : 16,397.76 = 3,140.59 : x
2. Step 2: Convert to fraction form
   10,931.78/16,397.76 = 3,140.59/x
3. Step 3: Cross multiply
   10,931.78x = 16,397.76 × 3,140.59
4. Step 4: Simplify right side
   10,931.78x = 51,498,559.09
5. Step 5: Solve for x
   x = 51,498,559.09/10,931.78
6. Step 6: Final answer
   x = 4,710.91