Finding the Fourth Proportional to 11,628.38, 16,089.42 and 10,139.40

Step by Step Solution

1. Step 1: Write the proportion equation
   11,628.38 : 16,089.42 = 10,139.40 : x
2. Step 2: Convert to fraction form
   11,628.38/16,089.42 = 10,139.40/x
3. Step 3: Cross multiply
   11,628.38x = 16,089.42 × 10,139.40
4. Step 4: Simplify right side
   11,628.38x = 163,137,065.15
5. Step 5: Solve for x
   x = 163,137,065.15/11,628.38
6. Step 6: Final answer
   x = 14,029.22