Finding the Fourth Proportional to 11,908.55, 16,421 and 10,040.71

Step by Step Solution

1. Step 1: Write the proportion equation
   11,908.55 : 16,421 = 10,040.71 : x
2. Step 2: Convert to fraction form
   11,908.55/16,421 = 10,040.71/x
3. Step 3: Cross multiply
   11,908.55x = 16,421 × 10,040.71
4. Step 4: Simplify right side
   11,908.55x = 164,878,498.91
5. Step 5: Solve for x
   x = 164,878,498.91/11,908.55
6. Step 6: Final answer
   x = 13,845.39