Finding the Fourth Proportional to 11,139.40, 16,717.50 and 7,621

Step by Step Solution

1. Step 1: Write the proportion equation
   11,139.40 : 16,717.50 = 7,621 : x
2. Step 2: Convert to fraction form
   11,139.40/16,717.50 = 7,621/x
3. Step 3: Cross multiply
   11,139.40x = 16,717.50 × 7,621
4. Step 4: Simplify right side
   11,139.40x = 127,404,067.50
5. Step 5: Solve for x
   x = 127,404,067.50/11,139.40
6. Step 6: Final answer
   x = 11,437.25